In humans type A blood is dominant to type O blood, John has type A blood. His mother was type O. Martha also has type A blood. Both of her parents were type A, also. Their first child has type O blood. John had biology in high school and he thinks that Martha was unfaithful to him since he remembers that type A blood is due to a dominant gone, and since he. also has type A blood he thinks that any child they have must be type A. Is John correct? Explain.