Question

A couple with four children have two boys (i) Normal boy (ii) Colour-blind boy and none of two daughters is colorblind. Find out the correct genotype of parents.

	Mother	Father
(A)	$X^C{X}^c$	$X^{c}Y$
(B)	$X^c{X}^c$	$X^{c}Y$
(C)	$X^C{X}^C$	$X^{C}Y$
(D)	$X^C{X}^c$	$X^{C}Y$

• A. A
• B. B
• C. C
• D. D

Answer 1

The correct option is A A

Colour blindness is a sex linked recessive disorder. This deject is due to mutation in certain genes present in the X chromosomes. So according to the given problem -

Ref. image