Question

A human male is heterozygous for autosomal gene A, B and G. He is also homozygous for hemophilic gene h. What proportion of his sperm will be abgh?

• A. $\frac{1}{4}$
• B. $\frac{1}{8}$
• C. $\frac{1}{16}$
• D. $\frac{1}{32}$

Answer 1

Answer: (B)

$\frac{1}{8}$

For heterozygous condition of alleles, the number of types of gametes formed will be two, for each, here Aa, Bb and Gg are heterozygous, therefore number of gametes formed will be 8, given condition is homozygous haemophilic, hh, types of gametes will be 1.

that is probability of each gene in heterozygous condition is 1/2 while that in homozygous condition is 1 and the total number of gametes formed will be 8 of which only one sperm will contain a,b,g,h

So, the proportion of his sperm with abgh is 1/8

So, the correct answer is '1/8'