Color blindness is a sex linked recessive trait. A woman who is heterozygous for the tree and a male who is not colorblind have a son what is the probability of the son also being colorblind

If you have a son he will have a 1 in 12 chance of being colour blind. BUT if colour blindness runs in your (the mother’s) family there is a much higher chance that your boys will be colour blind, especially if the grandfather (mother’s father) is/was colour blind.