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Question

In a random mating population frequency of recessive allele is 0.5. What is the frequency of dominant phenotypes in population?

A
0.25
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B
0.50
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C
0.75
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D
0.20
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Solution

The correct option is C 0.75
In the given problem, frequency of recessive allele (q) is 0.5.
Hence, the frequency of dominant allele (p) is 1 - q = 1 - 0.5 = 0.5.
Frequency of homozygous dominant = p2 = 0.25.
Frequency of heterozygous dominant = 2pq = 2 * 0.5 * 0.5 = 0.5.
Hence, frequency of dominant phenotypes in a population = Frequency of homozygous dominant + Frequency of heterozygous dominant = 0.5 + 0.25 = 0.75.
Thus, the correct answer is '0.75'.

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