The ABO blood-typing system has been used to settle cases of disputed paternity. Suppose, as a geneticist, you must testify on a case in which the mother has type A blood, the child has type O blood, and the alleged father has type B blood. How would you respond to the following statements?
Attorney of the alleged father: "The mother has type A blood so the child's type O blood must have come from the father. My client has type B blood; he could not have fathered this child."
Mother's attorney: "Further tests prove this man is heterozygous, so he must be the father."
Use a Punnett Square to defend your response.