Red-green color blindness is controlled by an X-linked gene in humans.The allele that causes color blindness is recessive to the allele for normal vision.A man and woman both with normal vision had color-blind fathers.If this man and woman have a child, what is the probability that the child will be color blind?
A)1/2
B)1/4
C)1/8
D)1/3
E)0

Question

Quizplus · Accepted Answer

The man and woman both have normal vision, but their fathers were color-blind. This means that the man and woman are both carriers of the color-blindness allele. When they have a child, there is a 1/2 chance that the child will inherit the color-blindness allele from the mother and a 1/2 chance that the child will inherit the normal vision allele from the father. If the child inherits the color-blindness allele from the mother, then the child will be color-blind. If the child inherits the normal vision allele from the father, then the child will have normal vision. Therefore, the probability that the child will be color-blind is 1/2.

Red-Green Color Blindness Is Controlled by an X-Linked Gene in Humans.The