Geneticists have determined that the majority of individuals in an isolated island population have blood type

Question continuation;

... type B. Type A is found to be more common in the mainland population from which the island was settled.

How could a geneticist best explain the dominance of blood type B in the island population?

Multiple choices;

A. Random mutations have occurred in the island population.

B. Genetic drift has reduced the frequency of type A individuals.

C. Natural selection has only occurred in the mainland population.

D. Environmental conditions on the island are less favorable for type B individuals.

Answer;

B. Genetic drift has reduced the frequency of type A individuals.

Explanation;

-Genetic drift is a mechanism of evolution in which allele frequencies of a population change over generations due to chance.

-It occurs in all populations of non-infinite size, but its effects are strongest in small populations.