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20 June, 19:45

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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  1. 20 June, 19:48
    0
    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.
  2. 20 June, 20:12
    0
    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.
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