The document discusses the blood types of a man named Paul and his wife Sandra, both having type A blood. It poses the question of the probability that their first child will have type A blood and the second child will have type O blood. The probabilities depend on the genetic inheritance of the blood types from their parents.

1. 4. A man named Paul has type A blood. His father is type A B and his mother is homozygous for
type A . He married Sandra who also has type A blood but whose father is type A and whose
mother is type B. What is the probability that their first child will have type A blood? What is the
probability that their second child will have type O blood?