Question

1. A ship carrying 2,000 passengers sets sail for an island with a population of 23,000. Both of these populations consist of an equal number of males and females.

21 male passengers on the ship have an X-linked recessive condition. 15 of the male island inhabitants have the same condition, and no females on the ship or the island show the phenotype.

1. The ship docks, and a woman from the island falls pregnant to an unaffected man from the ship. What are the chances their first son will be affected with the condition?

2. An affected man from the island and a woman from the ship have a girl. What is the daughter’s chance of being a carrier?

3. What is the daughter’s chance of being affected?

Answer 1