Principles of Inheritance and Variation Question 26
26. In a population of 1000 individuals 360 belong to genotype AA, 480 to $Aa$ and the remaining 160 to aa. Based on this data, the frequency of allele $A$ in the population is:
(a) 0.4
(b) 0.5
(c) 0.6
(d) 0.7
Show Answer
Answer : c
Hints & Solution
(c) According to Hardy Weinberg principle, $p^{2}+2 pq+q^{2}=1 ;(p+q)^{2}=1$
(AA) $p^{2}=360$ out of 1000 individual
or $p^{2}=36$ out of 100
$q^{2}=160$ out of 1000 or $q^{2}=16$ out of 100
so $q=\sqrt{.16}=.4, Asp+q=1$
so $p$ is 0.6 .
