Question

if a marriage has taken place between a colour blind female and a normal male, what will be the offspring?

Answer 1

Dear student,

Colour blindness is a Sex-Linked disorder whose genes are located on the X-Chromosome:
​ + = Normal Vision (Dominant)
O = Color Blindness (Recessive)

The following shows the cross between a colour blind female and a normal male :

Gametes	X+	Y
Xo	X+Xo	XoY
Xo	X+Xo	XoY

Thus, the offspring obtained would be :
Two heterozygous normal vision females ​( X⁺X^o) and two blind males (X^oY).

Regards.