In meiosis the spermatozoa that are produced are genetically unlike each other and unlike the cell that produces them. This is one reason for the great variation among humans. What causes this effect?
A) crossing-over, chromosome segregation, and independent assortment
B) crossing-over and chromosome segregation only
C) chromosome segregation and independent assortment only
D) crossing-over and independent assortment only
Answer: D) crossing-over and independent assortment only