if a color blind woman marries a man with normal vision,how do you set up punnett square?

Answer 1

let B meancolor blind gene, C means seeing color

Mom Dad
BB CC BC BC BC BC so all have one copy of colorblindness. So, if the children are girls, they will have normal vision, if males, they are colorblind (males only have one X, so if they Carry the B on their X, they are colorblind)

So the expected frquency is 1/2 kids will be colorblind (the boys), and one have color seeing (the girls).