Question

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 abh?

• A.
  $1/16$
• B.
  $1/4$
• C.
  $1/8$
• D.
  $1/32$

Answer 1

The correct option is C

$1/8$
Heterozygous for A and B; Hemizygous for h. Therefore, the genotype would be: AaBbXh Y (hemizygous for h as in for human males can only fall on Y) (hemizygous for female would be Xh X) All the kinds of gametes you can get with this,

abXh
ABXh
abY
AbY
aBX
aBY
ABY
AbXh

but they are asking for portion of abXh. Therefore its ⅛ .
So, the correct answer is 1/8.