The probability of the daughter having colorblindness is relatively low due to the fact that the dominant allele masks the recessive allele that causes colorblindness. Females have a greater opportunity to hide alleles with genes from their other x chromosome, because most genes are found on the x chromosome, unlike males who have a y chromosome that has very little genetic information and unable to hide the recessive gene for colorblindness. This being the reason the son inherited the colorblind trait from his mother. Since the mother was able to hide the colorblind recessive trait due to her possessing the x
