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NEET2004ZoologyPrinciples of Inheritance and VariationActual

A male human is heterozygous for autosomal genes A and B and is also hemizygous for hemophilic gene h . What proportion of his sperms will be a b h ?

Options

  1. A1 8
  2. B1 32
  3. C1 16
  4. D1 4 .

Correct answer

A. 1 8

Step-by-step solution

Genotype of male = AaBbX X ^ h Y Number of gametes =2^n Where n = no. of heterozygous alleles (genes A, B, sex chromosome) Thus, Number of gametes =(2)^3=8 The gametes produced wil be = abX ^ h , a b Y, ABX ^ h , aBY , aBX ^ h , AbY , ABY and AbX ^ h . Hence, number of sperm carrying abh =1 / 8 .

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