Genotype of woman: Bb X^C X^c
Genotype of man: bb X^C Y
Probability of brown eyes = 1/2
Probability of colorblind male = 1/4
Probability of brown-eyed colorblind male = 1/2 X 1/4 = 1/8
2. Genotypes are the same as before. You know the fetus is a boy. So, he has a 50% chance of being colorblind.