Question

A typhoon devastates the small population on Island A and only a few individuals survive. Several generations later, the Island A population suffers from inherited disorders that are very rare on the mainland in other groups. What genetic event explains what happened on Island A?

a.) A random mutation led to formation of the disorder alleles.

b.) A founder effect led to an increase in the frequency of the disorder alleles.

c.) A population bottleneck led to an increase in the frequency of the disorder alleles.

d.) A population bottleneck led to an increase in the reproduction rate.

Answer 1

A typhoon devastates the small population on Island A and only a few individuals survive, then these few individuals reproduced and increased the size of the population in the island, this is an example of a population of a bottleneck, the typhoon had decreased the number of individuals and decreased the number normal alleles randomly, so the few individuals left after the typhoon had the alleles for diseases, so Several generations later, the Island A population suffers from inherited disorders that are very rare on the mainland in other groups.

c) A population bottleneck led to an increase in the frequency of the disorder alleles.

( founder effect, the frequency of alleles in a population depends on the frequency of alleles in the population which founded it.)