Q. 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 :

Q. 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) 0.7

(b) 0.4

(c) 0.5

(d) 0.6

Solution :

Correct option : D According to Hardy-Weinberg equilibrium, the genetic variation in a population will remain constant from one generation to the next in the absence of disturbing factors. Equation: p2 +2pq + q2 = 1 where, p2 is the frequency of homozygous genotype AA q2 is the frequency of genotype aa 2pq is the frequency of genotype Aa There are 1000 individuals, out of which 360 belong to genotype AA. p2 =360/1000 = 0.36Then p = 0.6. So, the correct answer is ‘0.6’.