Color-blind is a inherited trait linked to the X chromosome, so the men are most likely to present the disease since they only have one X chromosome, while women must be homozygous for the gene in both of their X chromosomes to have the disease. In a crossing of a color-blind father with a mother who does not carry the allele for the disease, the probability that a male child be color-blind is:
Their male child will not be color-blind, since the mother don't have the allele for the disease. Therefore, any male child will not inherit the color-blindness trait. The probability is equal a 0.