A male human is heterozygous for autosomal genes A and B. He is also hemizygous for haemophilic gene h. What proportion of his sperms will be abh?

Question

A male human is heterozygous for autosomal genes A and B. He is also hemizygous for haemophilic gene h. What proportion of his sperms will be abh? (A) (1/8) (B) (1/32) (C) (1/16) (D) (1/4)

Tardigrade Admin · Accepted Answer

Chance of getting a=(1/2) Chance of getting b=(1/2) Chance of getting h=(1/2) Chance of getting sperms with a b h=(1/2) × (1/2) × (1/2)=(1/8)

Q. A male human is heterozygous for autosomal genes A and B. He is also hemizygous for haemophilic gene h. What proportion of his sperms will be abh?

$\frac{1}{8}$

$\frac{1}{32}$

$\frac{1}{16}$

$\frac{1}{4}$

Chance of getting $a = \frac{1}{2}$
Chance of getting $b = \frac{1}{2}$
Chance of getting $h = \frac{1}{2}$
Chance of getting sperms with
$abh = \frac{1}{2} \times \frac{1}{2} \times \frac{1}{2} = \frac{1}{8}$

Q. A male human is heterozygous for autosomal genes A and B. He is also hemizygous for haemophilic gene h. What proportion of his sperms will be abh?

81​

321​

161​

41​

Chance of getting a=21​ Chance of getting b=21​ Chance of getting h=21​ Chance of getting sperms with abh=21​×21​×21​=81​

$\frac{1}{8}$

$\frac{1}{32}$

$\frac{1}{16}$

$\frac{1}{4}$

Chance of getting $a = \frac{1}{2}$
Chance of getting $b = \frac{1}{2}$
Chance of getting $h = \frac{1}{2}$
Chance of getting sperms with
$abh = \frac{1}{2} \times \frac{1}{2} \times \frac{1}{2} = \frac{1}{8}$