An example of genetic drift is allele frequencies change randomly each generation. The correct option is A.
What is genetic drift?
Genetic drift is the change in allele frequency or variation in gene which is totally random. Changes in allele frequencies are used to measure these differences in allele presence. Genetic drift occurs when the frequency of different alleles, or variable forms of a gene, fluctuates over time through chance.
The causes of genetic drift are many, like leaving of some offspring form a population will reduce the genes will increase or decrease of a population over generation.
Examples are green eyes or pink monkey. The green eyes gen will always be recessive, so the gene will reduce with time and if the pink monkey female will mate with white monkey male only then the chances of pink monkey will reduce.
Thus, the correct option is A. Allele frequencies change randomly each generation.
To learn more about genetic drift, refer to the link:
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