What type of chromosomal abnormality leads to the phenotype known as Down syndrome?
a) trisomy 22
b) trisomy 21
c) monosomy 21
d) monosomy 22
e)Either the first or third answer choices could lead to Down syndrome.
Answer: b) trisomy 21
What type of chromosomal abnormality leads to the phenotype known as Down syndrome?
a) trisomy 22
b) trisomy 21
c) monosomy 21
d) monosomy 22
e)Either the first or third answer choices could lead to Down syndrome.
Answer: b) trisomy 21