What contributes to genetic variation during human reproduction?
BIOLOGY
SAT 2021
What contributes to genetic variation during human reproduction?
- A. Nonrandom mating
- B. Crossing over
- C. Independent assortment
- D. All of these
Correct Answer: D. All of these
Explanation
All three contribute to giving rise to genetic variation. Independent assortment allows for the chromosomes to assort in millions of random of combinations during fertilization. Crossing over between chromosomes produces recombinant chromosomes, or the combination of chromosomal DNA from two parents into one chromosome. Random fertilization allows aids with variation because it means any sperm can fertilize any egg. It is sometimes easy to overlook, but humans do not mate randomly. Lots of energy is put into choosing an optimal mate with whom to reproduce.
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