Why do mutations appear more often with selective breeding?

Why do mutations appear more often with selective breeding? A - They are selected for a desirable trait B - Genetic diversity is increased C - Desirable...

Our modern corn was created through artificial selection from the ancestral plant

Our modern corn was created through artificial selection from the ancestral plant A - Alfalfa B - Chihuahua C - Wheat D - Teosinte Answer: D...

What is the main difference between natural selection and artificial selection?

What is the main difference between natural selection and artificial selection? A - Individuals choose to adapt in natural selection but are forced...

Which is NOT a trait that might be selected for through artificial selection?

Which is NOT a trait that might be selected for through artificial selection? A - Decreased disease resistance B - Accelerated growth C - Faster running...

Artificial selection is also known as

Artificial selection is also known as A - Out-breeding B - Mutation breeding C - Rapid evolution D - Selective breeding E - Natural selection Answer: D...

What best describes natural selection?

What best describes natural selection? A - Organisms with lighter coloration are more likely to survive and reproduce B - Organisms best suited to...

What color of moth was most common before the Industrial Revolution?

What color of moth was most common before the Industrial Revolution? A - Both the light and dark colored moths were common B - The light-gray colored...

What best describes directional selection?

What best describes directional selection? A - Natural selection in the direction of one trait extreme to another B - Natural selection for dark colors C...

How did the Industrial Revolution help the dark-colored moths become more common?

How did the Industrial Revolution help the dark-colored moths become more common? A - It reduced predation on the light-colored moths B - It lightened...

Why is the peppered moth phenomenon uncommon?

Why is the peppered moth phenomenon uncommon? A - Adaptations normally occur over very short periods of time B - Moths can fly away to new environments...

What is true about random mutations?

What is true about random mutations? A - They are always positive B - They introduce new variation into a population C - They make measuring variation...

Genetic variability describes which of the following?

Genetic variability describes which of the following? A - How likely a variation is to be hereditary B - The potential for a characteristic to vary...

Why is evolution best described as an editing process?

Why is evolution best described as an editing process? A - It creates "fitter" organisms B - It selects for individuals with traits best suited for...

What best describes genetic variation?

What best describes genetic variation? A - The potential for a characteristic to vary within a population B - The amount of variation in an individual's...

Which is true about evolution?

Which is true about evolution? A - It creates genetic variation B - It occurs within a population C - It occurs among individuals D - It decreases...

A postzygotic __________ is a mechanism that reduces the viability or reproductive capacity of hybrid offspring.

A postzygotic __________ is a mechanism that reduces the viability or reproductive capacity of hybrid offspring. A - Reproductive barrier B - high...

A scientist mates a blue population of lizards with a red population of lizards. She observes that one out of ten hybrid offspring survive to adulthood compared to roughly, eight out of ten blue or red lizards. This is an example of

A scientist mates a blue population of lizards with a red population of lizards. She observes that one out of ten hybrid offspring survive to adulthood...

A farmer mates a goat and a sheep together. However, he finds he cannot use this hybrid animal to produce any new hybrids. This is an example of

A farmer mates a goat and a sheep together. However, he finds he cannot use this hybrid animal to produce any new hybrids. This is an example of A...

A scientist mates two different organisms, She observes no offspring. A closer inspection reveals that the hybrid embryo does not develop properly. This is an example of

A scientist mates two different organisms, She observes no offspring. A closer inspection reveals that the hybrid embryo does not develop properly....

Which of the following statements is true?

Which of the following statements is true? A - A prezygotic reproductive barrier reduces the reproductive capacity of hybrid offspring B - Both prezygotic...

A zoo wants to assist two related endangered species with their reproduction and plans to directly implant the sperm into the female. Which type of isolation cannot be overcome this way?

A zoo wants to assist two related endangered species with their reproduction and plans to directly implant the sperm into the female. Which type of...

One species of sea urchin is able to mate with another, but fertilization is rarely successful. What is this an example of?

One species of sea urchin is able to mate with another, but fertilization is rarely successful. What is this an example of? A - Spatial B - Behavioral C...

Two species of plants that do not cross-pollinate are an example of ________ isolation because they flower at different times of the year.

Two species of plants that do not cross-pollinate are an example of ________ isolation because they flower at different times of the year. A - Spatial B...

One way to overcome behavioral isolation that prevents animals from reproducing might be to ______.

One way to overcome behavioral isolation that prevents animals from reproducing might be to ______. A - Clone the animals and raise them in a laboratory B...

Spatial isolation is the main reason why _______ do not mate.

Spatial isolation is the main reason why _______ do not mate. A - Siberian and South China tigers B - Red pandas and giant pandas C - Sharks and dolphins D...

A population of lizards is split by an earthquake which leaves half of the population on an island and the other half on the tip of the peninsula. These lizards cannot swim. What type of speciation will occur?

A population of lizards is split by an earthquake which leaves half of the population on an island and the other half on the tip of the peninsula. These...

Define speciation.

Define speciation. A - It is the process by which two or more species converge to become one species B - It is the process by which an independent...

Identify the factor that is responsible for allopatric speciation and NOT for sympatric speciation

Identify the factor that is responsible for allopatric speciation and NOT for sympatric speciation A - Gene mutation B - Physical barrier C - Competition D...

Which of the following four statements about species is MOST accurate?

Which of the following four statements about species is MOST accurate? A - Animals which look different are classified as different species B - Animals...

Polyploidy has contributed to which of the following patterns of speciation?

Polyploidy has contributed to which of the following patterns of speciation? A - Allopatric speciation in plants B - Sympatric speciation in animals C...

A situation in which two alleles of a gene are maintained in a population because heterozygotes are more fit than their homozygous counterparts are called

A situation in which two alleles of a gene are maintained in a population because heterozygotes are more fit than their homozygous counterparts are...

A scientist has observed animals in a particular habitat for some time. She notices that the slower gazelles tend ti fall victim to predators more frequently than faster ones. Over time, she notes that the gazelle herd on average runs faster. She is observing

A scientist has observed animals in a particular habitat for some time. She notices that the slower gazelles tend ti fall victim to predators more frequently...

Some studies have shown that a single copy of the cystic fibrosis disease allele can confer resistance to tuberculosis to a person. This is an example of

Some studies have shown that a single copy of the cystic fibrosis disease allele can confer resistance to tuberculosis to a person. This is an example...

A scientist has observed animals in a particular habitat for some time. She notices that in a population of birds those with either short or long beaks can find more food than those with average sized beaks. Over time, she notices a higher proportion of birds in the population have either short or long beaks. She is observing:

A scientist has observed animals in a particular habitat for some time. She notices that in a population of birds those with either short or long beaks...

Which of the following forces is LEAST likely to cause a new species to arise in a population?

Which of the following forces is LEAST likely to cause a new species to arise in a population? A - Balanced polymorphism B - incomplete dominance C...

Which of the following is an example of convergent evolution?

Which of the following is an example of convergent evolution? A - The bones in a human hand are similar to those in a dog's paw B - Whales and fish...

Which of the following is an example of a homologous structure or trait?

Which of the following is an example of a homologous structure or trait? I. Leg bones of a human and leg bones of a penguin II. Wing of a penguin and...

A new mutation allows a cheetah to run faster and hunt down more prey than its slower counterparts. This mutation increased the _________ of the cheetah.

A new mutation allows a cheetah to run faster and hunt down more prey than its slower counterparts. This mutation increased the _________ of the cheetah. A...

Which of the following is an example of analogous structures or traits?

Which of the following is an example of analogous structures or traits? I. Leg bones of a human and leg bones of a penguin II. Wing of a penguin and...

A scientist notices several birds in the same area that are similar in appearance with the exception of different beak lengths. She observes that one type of bird with a particularly long beak can pick bugs out of holes in the ground, while the birds with shorter beaks cannot. The longer beak is an example of

A scientist notices several birds in the same area that are similar in appearance with the exception of different beak lengths. She observes that one...

Consider a population of fish where the length of a given fish's dorsal spine is determined by a single gene, which is defined by two different alleles. The dominant A allele encodes a long dorsal spine and the recessive a allele encodes a short dorsal spine. The fish is diploid and reproduces sexually. If the number of AA individuals is 500, the number of Aa individuals is 200, and the number of aa individuals is 300, then is this population in equilibrium? Why or why not?

Consider a population of fish where the length of a given fish's dorsal spine is determined by a single gene, which is defined by two different alleles....

Consider a population of fish where the length of a given fish's dorsal spine is determined by a single gene, which is defined by two different alleles. The dominant A allele encodes a long dorsal spine and the recessive a allele encodes a short dorsal spine. The fish is diploid and reproduces sexually. If the number of AA individuals is 500, the number of Aa individuals is 200, and the number of aa individuals is 300, then what is the chance that I will catch a fish with a long dorsal spine from this population?

Consider a population of fish where the length of a given fish's dorsal spine is determined by a single gene, which is defined by two different alleles....

After observing a population of fish with interesting protective spines, a scientist decides to move two of the fish into a new pond to create a new population of fish to study the ability of the fish to survive a new set of predators. Which of the following evolutionary agents did the scientist introduce?

After observing a population of fish with interesting protective spines, a scientist decides to move two of the fish into a new pond to create a new...

Consider a population of fish where the length of a given fish's dorsal spine is determined by a single gene, which is defined by two different alleles. The dominant A allele encodes a long dorsal spine and the recessive a allele encodes a short dorsal spine. The fish is diploid and reproduces sexually. The number of AA individuals in this population is 500, the number of Aa individuals is 100, and the number of aa individuals is 400. If a new population was started with 10 AA, 20 Aa, and 10 aa fish, then what are the new allelic frequencies?

Consider a population of fish where the length of a given fish's dorsal spine is determined by a single gene, which is defined by two different alleles....

How do losses of alleles in natural selection differ from losses of alleles in genetic drift?

How do losses of alleles in natural selection differ from losses of alleles in genetic drift? A - In natural selection, alleles are lost if they do...

The coat color gene of a population of squirrels is defined by a dominant allele G, which encodes a gray coat, and a recessive allele g, which encodes a black coat. In a population, genetic typing reveals the genotypic distribution to be 50 GG, 30 Gg, and 20 gg. What is the allelic frequency of the G allele?

The coat color gene of a population of squirrels is defined by a dominant allele G, which encodes a gray coat, and a recessive allele g, which encodes...

The coat color gene of a population of squirrels is defined by a dominant allele G, which encodes a gray coat, and a recessive allele g, which encodes a black coat. In a population, genetic typing reveals the genotypic distribution to be 50 GG, 30 Gg, and 20 gg. If this population is in equilibrium, then what should the genotypic frequency of Gg squirrels in this population be?

The coat color gene of a population of squirrels is defined by a dominant allele G, which encodes a gray coat, and a recessive allele g, which encodes...

The coat color gene of a population of squirrels is defined by a dominant allele G, which encodes a gray coat, and a recessive allele g, which encodes a black coat. In a population, genetic typing reveals the genotypic distribution to be 50 GG, 30 Gg, and 20 gg. If this population is in equilibrium, then what should the genotypic frequency of GG squirrels in this population be?

The coat color gene of a population of squirrels is defined by a dominant allele G, which encodes a gray coat, and a recessive allele g, which encodes...

The coat color gene of a population of squirrels is defined by a dominant allele G, which encodes a gray coat, and a recessive allele g, which encodes a black coat. In a population, genetic typing reveals the genotypic distribution to be 50 GG, 30 Gg, and 20 gg. If this population is in equilibrium, then what should the genotypic frequency of gg squirrels in this population be?

The coat color gene of a population of squirrels is defined by a dominant allele G, which encodes a gray coat, and a recessive allele g, which encodes...

The coat color gene of a population of squirrels is defined by a dominant allele G, which encodes a gray coat, and a recessive allele g, which encodes a black coat. In a population, genetic typing reveals the genotypic distribution to be 50 GG, 30 Gg, and 20 gg. What is the allelic frequency of the g allele?

The coat color gene of a population of squirrels is defined by a dominant allele G, which encodes a gray coat, and a recessive allele g, which encodes...

Why do scientists use the Hardy-Weinberg equation?

Why do scientists use the Hardy-Weinberg equation? A - To study the genotypic frequency in a genetic cross B - To study the genotypic frequency in...

Select the statements about Hardy-Weinberg equilibrium that are true.

Select the statements about Hardy-Weinberg equilibrium that are true. I. Hardy-Weinberg equilibrium is often found in the wild. II. The allele frequency...

Which of the following criteria must be met for Hardy-Weinberg equilibrium?

Which of the following criteria must be met for Hardy-Weinberg equilibrium? I. Beneficial trait II. Non-random mating III. Large population size A...

Using the criteria outlined in the Hardy-Weinberg equilibrium, determine which of the following populations can be balanced.

Using the criteria outlined in the Hardy-Weinberg equilibrium, determine which of the following populations can be balanced. A - A population of parrots...

The study of the allelic, genotypic, and phenotypic variation within a population is referred to as _______.

The study of the allelic, genotypic, and phenotypic variation within a population is referred to as _______. A - Phenotypic genetics B - Genotypic...

What are homologous genes?

What are homologous genes? A - Genes that are different between organisms B - Genes that are similar between organisms C - Genes that accumulate change...

Which best describes the general rate of evolution?

Which best describes the general rate of evolution? A - It takes at least 6.5 million years for a new species to form B - On average it takes 6.5...

Which is NOT true about the fossil record?

Which is NOT true about the fossil record? A - It is a complete record B - It provides information about evolution on Earth C - None are correct D...

Punctuated equilibria describes which phenomenon?

Punctuated equilibria describes which phenomenon? A - Sudden appearance of species followed by long periods of little change B - Long periods of constant...

What is a genome?

What is a genome? A - The number of nucleotides in an organism's DNA that change over time B - The part of an organisms genetic information that matches...

Which does NOT provide evidence for evolution?

Which does NOT provide evidence for evolution? A - Comparative anatomy B - Bio-geography C - Molecular biology D - Climatology E - Paleontology Answer: D...

Which field would best describe why penguins and polar bears are not found in the same regions of Earth?

Which field would best describe why penguins and polar bears are not found in the same regions of Earth? A - Homology B - Molecular biology C - Paleontology D...

Comparative anatomy is useful for all but which if the following?

Comparative anatomy is useful for all but which if the following? A - Homologous features in adults B - Very closely related species C - Homologous...

Paleontology is the study of

Paleontology is the study of A - Fossils and the fossil record B - Species distribution across Earth C - Homologous structures D - Homologous DNA E...

How does the fossil record support evolution?

How does the fossil record support evolution? A - It creates a timeline of evolutionary events from oldest to youngest B - It layers fossils from...

Which of the following is an example of natural selection?

Which of the following is an example of natural selection? I. Albino animals are rare in nature because they are easy for predators to find. II. The...

The study of the genetic variation within a population is known as

The study of the genetic variation within a population is known as A - Lamarkian genetics B - Population genetics C - population dynamics D - Natural...

Which of the following is NOT a principle of Darwin's theory of evolution?

Which of the following is NOT a principle of Darwin's theory of evolution? A - An individual can evolve B - Individuals with different genotypes may...

Which of the following statements does not represent the idea of acquired characteristics?

Which of the following statements does not represent the idea of acquired characteristics? I. A body builder develops stronger muscles during the course...

_________ can be defined as a change in a characteristic within a population over time.

_________ can be defined as a change in a characteristic within a population over time. A - Lamarckian inheritance B - Natural selection C - Evolution D...

Sea turtles lay hundreds of eggs with the hope that a few of their offspring will survive to adulthood. This is an example of which type of survivor-ship curve?

Sea turtles lay hundreds of eggs with the hope that a few of their offspring will survive to adulthood. This is an example of which type of survivor-ship...

What is a survivor-ship curve?

What is a survivor-ship curve? A - A scientific analysis on the highest cause of death among various species B - A graph that measures the proportion...

Small mammals, such as rabbits, have many predators and are often hunted by humans and killed on the roadways. they often die at various ages. This is an example of which type of survivor-ship?

Small mammals, such as rabbits, have many predators and are often hunted by humans and killed on the roadways. they often die at various ages. This...

Elephants have a high probability of living into middle age and adulthood. After becoming adults, their chances of dying increase greatly. Which type of survivor-ship curve depicts an elephant's life?

Elephants have a high probability of living into middle age and adulthood. After becoming adults, their chances of dying increase greatly. Which type...

There are _____ types of survivor-ship curves.

There are _____ types of survivor-ship curves. A - 2 B - 5 C - 3 D - 4 Answer: C - 3 They are called Type I, Type II, and Type III...

What is a fate map?

What is a fate map? A - A specific set of genes that gives step by step directions to a cell so that is differentiates correctly B - A specific route...

Being able to activate expression of a fluorescent protein when a specific gene is expressed has been most useful for fate mapping in which of the following organisms?

Being able to activate expression of a fluorescent protein when a specific gene is expressed has been most useful for fate mapping in which of the following...

From which of these organisms have scientists created the most complete and detailed fate map?

From which of these organisms have scientists created the most complete and detailed fate map? A - C. elegans B - Mice C - Frogs D - Humans E - Zebra...

What is a somatic cell?

What is a somatic cell? A - A cell that can still become any cell type B - A cell that has already differentiated C - A non-reproductive cell D -...

Out of all the following organisms, which one would you expect to have the least complete and detailed fate map?

Out of all the following organisms, which one would you expect to have the least complete and detailed fate map? A - Humans B - Chickens C - Zebra...

Which extra-embryonic membrane functions to remove waste from the embryo in n=both birds and mammals?

Which extra-embryonic membrane functions to remove waste from the embryo in n=both birds and mammals? A - The amnion B - None of them C - The allantois D...

What is the biggest difference between a liver cell and a brain cell?

What is the biggest difference between a liver cell and a brain cell? A - Their shape B - Their gene expression C - The genes that they have D - Their...

Which of the following is NOT a true statement about transcription factors?

Which of the following is NOT a true statement about transcription factors? A - Transcription factors are key regulators of gene expression B - A...

The process by which a cell becomes a functional, mature cell of a specific type is known as

The process by which a cell becomes a functional, mature cell of a specific type is known as A - Binding B - Transcription C - Signaling D - Differentiation E...

What is a ligand?

What is a ligand? A - A protein that makes a connection between two cells B - A protein that binds to a specific DNA sequence C - A molecule that...

The transcription of the following genes is regulated by the following combinations of binding sites.

The transcription of the following genes is regulated by the following combinations of binding sites. - Gene 1 is regulated by binding sites A, B and...

What is a protease?

What is a protease? A - A protein that inhibits receptors and other proteins B - A protein that degrades other proteins C - An enzyme that aids in...

Which of the following contribute to the formation of the concentration gradient of BMP-4 in the frog embryo?

Which of the following contribute to the formation of the concentration gradient of BMP-4 in the frog embryo? I. BMP-4 is produced in the ventral portion...

Which of the following statements is true about the chordin?

Which of the following statements is true about the chordin? A - It is produced in Spemann's organizer and inhibits Xolloid B - It is produced in...

When chordin binds to BMP-4, what effect does this have on the BMP-4 concentration gradient?

When chordin binds to BMP-4, what effect does this have on the BMP-4 concentration gradient? A - It sharpens the concentration gradient by degrading...

Xolloid is a(n)

Xolloid is a(n) A - Protease B - Nucleic acid C - Inhibitor D - Receptor E - Signaling molecule Answer: A - Protease Xolloid is a protease...

Which of the following is true about Spemann's experiments with 2-cell-stage embryos?

Which of the following is true about Spemann's experiments with 2-cell-stage embryos? A - The experiments resulted in embryos with two sets of body...

Which of the following is not an organizer?

Which of the following is not an organizer? A - Spemann's organizer B - The dorsal lip C - The ventral side of the gastrula D - The node E - Hensen's...

Which of the following refers to the underbelly side of an animal?

Which of the following refers to the underbelly side of an animal? A - Ventral B - Posterior C - Anterior D - Dorsal e - Sagittal Answer: A...

What is "the node"?

What is "the node"? A - The part of the embryo that will eventually become the brain B - None of these C - The center of the developing embryo D -...

How were Spemann and Mangold able to tell that the organizer was directing cells of the host embryo to change their fates?

How were Spemann and Mangold able to tell that the organizer was directing cells of the host embryo to change their fates? A - They assumed that all...

After gastrulation has occurred, the inner layer of cells is called what?

After gastrulation has occurred, the inner layer of cells is called what? A - The mesoderm B - The ICM C - The endoderm D - The epiblast E - The...

Why doesn't the outer layer of cells in the mammalian blastocyst become the ectoderm during mammalian gastrulation?

Why doesn't the outer layer of cells in the mammalian blastocyst become the ectoderm during mammalian gastrulation? A - All the cells in the layer...

What is the main purpose of gastrulation?

What is the main purpose of gastrulation? A - None of these B - Formation of the gut tube C - Formation of the primary germ layers D - Formation of...

In this drawing of a frog gastrula, which letter corresponds to the ectoderm?

In this drawing of a frog gastrula, which letter corresponds to the ectoderm? A - A B - E C - C D - B E - D Answer: A - A...

The heart, blood vessels, blood cells, skeleton, kidneys, spleen, and muscles are all tissues or organs that arise from what primary germ layer?

The heart, blood vessels, blood cells, skeleton, kidneys, spleen, and muscles are all tissues or organs that arise from what primary germ layer? A...

Which of the following is crucial for proper development of a baby's lungs?

Which of the following is crucial for proper development of a baby's lungs? A - The yolk sac B - Amniotic fluid C - The amnion D - The chorion E -...

Which extra-embryonic membrane is used by mammals to form part of the placenta?

Which extra-embryonic membrane is used by mammals to form part of the placenta? A -The yolk sac B - The chorion C - The allantois D - The amnion E...

Which of the following is NOT a true statement about the placenta?

Which of the following is NOT a true statement about the placenta? A - It is an organ that is found in all species B - It attaches the fetus to the...

Which of the four extra-embryonic membranes maintains the same form and functions in birds and mammals?

Which of the four extra-embryonic membranes maintains the same form and functions in birds and mammals? A - The amnion B - The allantois C - The yolk...

Which extra-embryonic membrane has a well-developed vascular structure that contributes to the vascular system of the developing mammalian embryo?

Which extra-embryonic membrane has a well-developed vascular structure that contributes to the vascular system of the developing mammalian embryo? A...

The embryonic-derived portion of the placenta is called

The embryonic-derived portion of the placenta is called A - Chorion B - Fetus C - Blastocyst D - Trophoblasts Answer: A - Chorion The chorion...

Which of the following contains mostly maternal cells?

Which of the following contains mostly maternal cells? A - The intervillus space B - The chorionic villi C - The capillaries within the chorionic...

Which part of the mammalian blastocyst will eventually become the embryo itself and its surrounding membranes?

Which part of the mammalian blastocyst will eventually become the embryo itself and its surrounding membranes? A - The ICM B - The blastula C - The...

Which of the following is a true statement?

Which of the following is a true statement? A - Oxygen diffuses from the maternal blood in the intervillous space, through trophoblasts in the chorionic...

Mary is pregnant and is telling you about how she is worried that her baby is floating around in her uterus with noting holding him in place. Which of the following would be most helpful to tell Mary about in order to ease her worries?

Mary is pregnant and is telling you about how she is worried that her baby is floating around in her uterus with noting holding him in place. Which...

Which of the following is an important function of the zona pellucida?

Which of the following is an important function of the zona pellucida? A - Provide proteins which bind to the extracellular matrix of the uterine...

Which of the following best describes what can be found in chorionic villi?

Which of the following best describes what can be found in chorionic villi? A - Fetal blood vessels B - Fetal blood vessels and maternal blood C -...

When do trophoblasts do after the blastocyst attaches to the uterine wall?

When do trophoblasts do after the blastocyst attaches to the uterine wall? A - They do all of these B - They invade deeper into the uterine wall C...

When and how does the blastocyst use proteases?

When and how does the blastocyst use proteases? A - The blastocyst uses proteases to hatch from the zona pellucida when it reaches the uterus, and...

Which of the following statements is true about the intervillous space?

Which of the following statements is true about the intervillous space? A - The blood in the intervillous space is in direct contact with embryonic...

The structure within the ovary in which a primary oocyte grows and develops is called the

The structure within the ovary in which a primary oocyte grows and develops is called the A - Follicle B - Egg C - Ovum D - Polar body Answer: A...

Which of the following is the last stage of mammalian development to occur before implantation in the uterus?

Which of the following is the last stage of mammalian development to occur before implantation in the uterus? A - Morula B - Ovum C - Blastocyst D...

Which embryonic stage consists of a solid, compact mass of sixteen or more cells?

Which embryonic stage consists of a solid, compact mass of sixteen or more cells? A - The morula B - The blastocyst C - The blastula D - The ICM Answer: A...

How does cleavage differ from normal mitosis?

How does cleavage differ from normal mitosis? A - The growth phases between divisions is faster B - There are no growth phases between divisions C...

Which of the following is NOT a factor that makes studying in human development difficult?

Which of the following is NOT a factor that makes studying in human development difficult? A - The small size of the early human embryo B - The brief...

The following image shows a diagram of spermatogenesis, the process by which male gametes, known as sperm, are created. How is the process different from oogenesis?

The following image shows a diagram of spermatogenesis, the process by which male gametes, known as sperm, are created. How is the process different...

Which of these cells only exists in the fallopian tubes?

Which of these cells only exists in the fallopian tubes? A - Oogonium B - Secondary oocyte C - Ovum D - Primary oocyte Answer: C - Ovum Since...

In humans, when are primary oocytes made?

In humans, when are primary oocytes made? A - Sometime between birth and the girl's second birthday B - Throughout a women's like until menopause C...

During oogenesis, when does the first meiotic division take place?

During oogenesis, when does the first meiotic division take place? A - Just before ovulation B - One to two months before a human female is born C...

Which of the following is a somatic cell?

Which of the following is a somatic cell? A - Spermatogonium B - Sperm cell C - Spermatid D - Spermatocyte E - Sertoli cell Answer: E - Sertoli...

What is the function of the acrosome?

What is the function of the acrosome? A - Penetrate the outer layers of the ovum B - Incorporate the sperm DNA into the nucleus of the ovum C - To...

Forty sperm are made by the end of spermatogenesis. How many spermatogonium entered meiosis?

Forty sperm are made by the end of spermatogenesis. How many spermatogonium entered meiosis? A - 8 B - 10 C - 4 D - 20 E - 1 Answer: B - 10 SPERMATOGOIUM...

Which of the following is true about sperm?

Which of the following is true about sperm? A - They are haploid and have one copy of each chromosome B - They are diploid and have two copies of...

What are the three basic components of a functional mature sperm cell?

What are the three basic components of a functional mature sperm cell? A - An acrosome, a flagellum, and mitochondria B - Mitochondria, a flagellum,...

In the early embryo, how are the positions of the mesoderm and endoderm different?

In the early embryo, how are the positions of the mesoderm and endoderm different? A - The mesoderm is the outermost layer of the cells, while the...

Select the statement that is TRUE about animal reproduction and development.

Select the statement that is TRUE about animal reproduction and development. A - Animals that reproduce asexually are called hermaphrodites B - Some...

Which of the following describes a zygote?

Which of the following describes a zygote? A - A multi-cellular embryo B - An embryo that has the three primary germ layers C - A fertilized ovum D...

Which axis organizes the body from head to tail?

Which axis organizes the body from head to tail? A - The anteroposterior axis B - The dorsoventral axis C - The cerebrospinal axis D - The left-right...

Select the set of event, in chronological order, as they occur during sexual reproduction in multi-cellular animals.

Select the set of event, in chronological order, as they occur during sexual reproduction in multi-cellular animals. A - Fertilization, cleavage,...