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What Are Alleles

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Question

If the frequency of a dominant phenotype in a stable population is $75 %$ , the frequency of recessive allele in that population would be

A

37.5 %

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B

75 %

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C

9.4 %

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D

50 %

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Solution

The correct option is D $50 %$
The given frequency of a dominant phenotype is $75 %$ and recessive will be $25 %$ . 75 : 25 (i.e.,) 3 : 1 ratio which is AA, Aa, Aa . a. Here allele A : a is 4 : 4 (i.e.) 50 : 50.

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What Are Alleles

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