Mark was suspicious that his wife was unfaithful to him. He obtained blood samples from all family members. When the results came back, it turned out that Mark has blood type AB. His wife has blood type O. They have three children. One child has blood type A. One child has blood type B. One child has blood type O. “You cheated!” Mark yells accusingly. Is he right to make such a statement or does he owe his wife an apology? Show your work with Punnett Squares or with a written explanation