What is the probability of a male having color blindness if his X chromosome carries the c allele? (He is Xc. XC determines normal color vision, it is dominant. Xc determines color blindness.)
A) 100%
B) 50%
C) 0%
D) 25%

Question

Quizplus · Accepted Answer

Since males have only one X chromosome, if it carries the allele for color blindness (Xc), they will express the trait because they do not have a second X chromosome that could potentially carry a normal vision allele (XC) to mask the color blindness allele.

What Is the Probability of a Male Having Color Blindness