A father with normal vision and a carrier mother (X^C X^c) have children. What is the probability that their first son will be red-green color blind?
Answer and explanation
Correct answer: C. 50 percent
- Step 1: Sons inherit the Y chromosome from the father and one X chromosome from the mother. Step 2. The mother has genotype X^C X^c and passes X^c to half her male offspring. Step 3. Given that the child is a son, the probability of inheriting the mutant allele X^c is 1/2 or 50%. Answer: 50 percent. Why not the others: 25% is the probability among all offspring regardless of sex; among sons specifically, the probability is 50%.
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