Question

If a sex-linked recessive trait is apparent in the father and the mother is a carrier, what is the probability that their son will have the trait?

1) 25%
2) 50%
3) 75%
4) 100%

Answer 1

The probability that their son will have the trait is 50%.

Step-by-step explanation:

The probability that their son will have the trait is 50%.

In case of a sex-linked recessive trait, if the father has the trait and the mother is a carrier, their son has a 50% chance of inheriting the trait. This is because the son receives one X chromosome from his mother, which may contain the recessive trait, and one Y chromosome from his father. If the X chromosome from his mother carries the trait, he will be affected.