Question

color blindness is an x-linked recessive trait. if a color-blind male marries a normal, homozygous female, what are the possible genotypes and phenotypes of the children?

Answer 1

Colour blind male means X'Y
Nomal femal means XX

on crossing you get : 2 X'X ; 2 XY

Genotypes (phenotypes) : 2 XY (normal male) and 2 X'X (carrier female with no colourblindness)

Answer 2

genotype of Colour blind male-
`X^(0) Y`

Genotype of normal homozygous female-
`X^(+) X^(+)`

The offspring produced will be

`2X^(+) Y` and
`2 X^(+) X^(0)`

`2X^(+) Y`-normal vision boy (50%)

`2 X^(+) X^(0)`- heterozygous normal vision girl -(50%). They are called carriers.