n fruit flies, a recessive gene causes wings to become curled, preventing the fl
ID: 96569 • Letter: N
Question
n fruit flies, a recessive gene causes wings to become curled, preventing the fly from being able to actually fly. In a population of 500 individuals, 10 of them show this trait. In this population:
For all answers, write them out to 2 decimal places. For example, 0.123 you would enter as 0.12. Do NOT enter these values as percentages.
What is the frequency of the homozygous dominant genotype?
What is the frequency of the heterozygous genotype?
What is the frequency of the homozygous recessive genotype?
Explanation / Answer
Consider recessive gene is qq = q2 = 10/500 = 0.02
frequency of the homozygous recessive genotype - q2 = 0.02
Take square root to find q = 0.14
We know that p + q = 1. So, p = 1-0.14 = 0.86
frequency of the homozygous dominant genotype - pp = p2 = 0.86 * 0.86 = 0.73
frequency of the heterozygous genotype - 2pq = 2 * 0.86 * 0.14 = 0.24
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