1. Hemophilia, disease in which the blood lacks a clotting factor, is caused by an X linked recessive gene. Joe doe not have hemophilia and Lucille is heterozygous for the condition. What is the chance that their MALE child will have hemophilia? (Note: you are calculating the probability for their MALE children only, in other words if they have 1 male child, what is the probability that he will be born with the disease?)
| 0% | ||
| 1/4 or 25% | ||
| 2/4 or 50% | ||
| 3/4 or 75% | ||
| 4/4 or 100% |