Discussion
Sampling of a gene pool occurs in sexual reproduction because :
Answer: A
Sampling occurs because not all gametes form zygotes.
Each parent produces a huge number of gametes, but only a few of them meet and form the next generation. The alleles carried by those few are a sample of the parents' gene pool, and by chance their frequencies can differ from the parental frequencies; this sampling error is the basis of genetic drift.
Every allele a parent carries does reach some of its gametes, through Mendelian segregation. Imperfect copying in meiosis and recombination shuffle alleles into new combinations, but they do not by themselves change the allele frequencies of the pool.
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