Question

A colour blind man marries a daughter of another colour blind man whose wife had a normal genotype. In their progeny.

• A. All the children will be colour blind
• B. All their sons are colour blind
• C. None of the daughters would be colour blind
• D. Half of their sons and half of their daughters would be colour blind

Answer 1

The correct option is D Half of their sons and half of their daughters would be colour blind

Given data:

$\left(1\right)$ Color blind man(x'y)

$\left(2\right)$ Color blind man(x'y) whose wife had a normal genotype (xx), so one of them daughter is carrier(x'x)

Colour blindness is x linked recessive disorder.

x' y

x' x'x' x'y

x x'x xy

x'x', x'y$\to$ affected

So, option D is correct.