Colourblindness is X recessive !
so ; colourblind male : X'Y
Normal homozygous female : XX
on crossing : outcomes are 2 X'X and 2 XY
so Genotypes are X'X , X'X, XY, XY
phenotypes are two Normal male child and two carrier female (heterozygous recessive )
IMP : None are colourblind !!
