population genetics For the population of an isolated southseas island, all the
ID: 177242 • Letter: P
Question
population genetics
For the population of an isolated southseas island, all the conditions of Hardy-Weinberg equilibrium are met except that inbreeding is rampant. Then the entire population is converted to a new religion that prohibits inbreeding, and the islanders begin to practice random mating. As a result of this change it can be predicted that...
A. Allele frequencies will change but genotype frequencies will not
B. Genotype frequencies will change but allele frequencies will not
C. Neither allele frequencies nor genotype frequencies will change
D. Both allele frequencies and genotype frequencies will change
E. The incidence of rare recessive diseases will increase
please explain why the answer is not D but is B? What makes allele frequencies change?
Explanation / Answer
Ans: The genotype frequencies will change but the allele frequencies will not.
This is because during inbreeding, the frequency of homozygotes increases and the heterozygotes frequency decreases but the alleles does not disappear. The alleles just shifts away from the Hardy Weinburg equilibrium. Now in random mating the genotype changes, but the allele frequency remains the same. So option B is correct.