Question

In humans, hemophilia is caused by a recessive allele on the X chromosome. Suppose a man with hemophilia has children with a healthy woman whose mother had hemophilia. If an ultrasound test shows that their first child is a girl, what is the probability that she has hemophilia?

Answer 1

50%.

Step-by-step explanation:

Based on the scenario being described within the question it can be said that the probability that the girl will have hemophilia would be 50%. This is because all children have a 50% chance that they will inherit the recessive gene from one of the parents or a normal gene. Therefore making the probability of the child whether it be a boy or a girl being born with hemophilia that of 50%.