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Principles of Inheritance and Variation question

2019 · Q4
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Principles of Inheritance and Variation question

2019 · Q4

NEETBiologyPrinciples of Inheritance and VariationMCQ+4 / −1
A gene locus has two alleles A, a. If the frequency of dominant allele A is 0.4, then what will be the frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population?
  1. A
    0.16(AA); 0.48 (Aa); 0.36(aa)
  2. B
    0.16 (AA); 0.36(Aa); 0.48(aa)
  3. C
    0.36 (AA); 0.48 (Aa); 0.16 (aa)
  4. D
    0.16 (AA); 0.24 (Aa); 0.36 (aa)
View written solutionFree

Correct answer: A

Frequency of dominant allele (say p) = 0.4


Frequency of recessive allele (say q) = 1 – 0.4 = 0.6


Frequency of homozygous dominant dividuals (AA) = p2 = (0.4)2 = 0.16


Frequency of heterozygous individuals (Aa) = 2pq = 2(0.4) (0.6) = 0.48


Frequency of homozygous recessive individuals (aa) = q2 = (0.6)2 = 0.36

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