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The four cells produced by meiosis are genetically unique because of independent assortment and:
ARepeated rounds of replication
BRandom loss of whole chromosomes
CDeliberate mutation of each gene
DRecombination during crossover
Answer & Solution
Correct answer: D. Recombination during crossover
1. Two mechanisms operate, not one.
2. The cells produced are genetically unique because of the random assortment of paternal and maternal homologs.
3. They are also unique because of the recombining of maternal and paternal segments of chromosomes, with their sets of genes, that occurs during crossover.
4. Replication happens only once and copies faithfully, so it adds no variety.
5. Chromosome loss is an error, not a normal source of variation.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 11 'Meiosis and Sexual Reproduction', sections 11.1-11.2_
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