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In a diploid population of 60 individuals, the genotype counts are 18 AA, 30 Aa and 12 aa. Calculate the frequencies of alleles A and a.

easy 2 marks Class 12 · Biology · Organisms and Populations
Answer
Allele frequencies are p_A = 0.55 and p_a = 0.45.

The correct answer is Allele frequencies are p_A = 0.55 and p_a = 0.45. — Thus the allele frequencies are and .

Step-by-step solution

  1. Total number of alleles in the population is .
  2. Number of (A) alleles = .
  3. Frequency of (A) (p) = .
  4. Number of (a) alleles = .
  5. Frequency of (a) (q) = .
  6. Thus the allele frequencies are and .
Common mistake: Forgetting to double homozygote counts when computing allele numbers

Concept tested: Allele frequency calculation

Published · How this solution was prepared and checked

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