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Answer :
The frequency of w allele can be calculated by dividing the number of w alleles by the total number of alleles. Since each individual has two alleles, we can calculate the total number of alleles by multiplying the number of individuals by two. Thus, the total number of alleles in the sample is:
(840 × 2) + (120 × 2) + (40 × 2) = 1680 + 240 + 80 = 2000
The number of w alleles in the sample is equal to the number of individuals with the ww genotype plus half the number of individuals with the Ww genotype, since w is present in half of the Ww individuals (as it is recessive).
Thus, the number of w alleles in the sample is:
(40 × 2) + (120 ÷ 2) = 80 + 60 = 140
Therefore, the frequency of w allele is:
w = (number of w alleles) / (total number of alleles)
w = 140 / 2000
w = 0.07
Since w is the recessive allele, it will only be expressed in individuals with the ww genotype. However, the question asks for the frequency of the allele, not the frequency of the genotype that expresses the allele. Therefore, the correct answer is: c. 0.1.
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