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sashaice [31]
3 years ago
10

Geneticist have determined that the majority of individuals in an isolate island population have blood type b. type a blood is f

ound 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.
Biology
2 answers:
almond37 [142]3 years ago
8 0
B. Genetic drift has reduced the frequency of type A individuals,which <span>explains the dominance of blood type b in the island population.

</span>Genetic drift is a<span> mechanism of evolution </span>during which allelomorph<span> frequencies of a population </span>modification<span> over generations </span>because of <span>sampling error.  The Genetic drift </span>happens in<span> populations of non-infinite size, </span>however<span> its effects </span>are<span> strongest in </span>tiny<span> populations.</span>
Oksi-84 [34.3K]3 years ago
5 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.


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