Geneticist have determined that the majority of individuals in an isolate island population have blood type b. type a blood is found to be more common in the mainland populations from which the island was settled. how would a geneticist explain the dominance of blood tpe b in the island population.

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.

Question

Biology

Beckett Robles

28 May, 12:53

Geneticist have determined that the majority of individuals in an isolate island population have blood type b. type a blood is found to be more common in the mainland populations from which the island was settled. how would a geneticist explain the dominance of blood tpe b in the island population.

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.

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Answers (2)

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Daphne Warren · Answer 1

The correct answer is genetic drift has minimized the frequency of type A individuals.

Usually, genetic drift takes place in small populations, where infrequently happening alleles encounter with a greater chance of getting lost. Once it starts, genetic drift will continue until the involved allele is the only allele present in a population at a specific locus or until the allele involved is lost.

In the given case, allele A is lost due to genetic drift phenomenon.

Braylen Costa · Answer 2

B. Genetic drift has reduced the frequency of type A individuals, which explains the dominance of blood type b in the island population.

Genetic drift is a mechanism of evolution during which allelomorph frequencies of a population modification over generations because of sampling error. The Genetic drift happens in populations of non-infinite size, however its effects are strongest in tiny populations.