You have seen a pedigree can be used to trace the inheritance pattern of a single-allele trait.

1.You have seen a pedigree can be used to trace the inheritance pattern of a single-allele trait. A pedigree can also be used to study multiple-allele traits. In the pedigree below, different blood types are identifi ed by the letters A, B, AB, and O. Examine the pedigree, and then answer the questions that follow.

Neither individual I-4 or I-6 has ever had their blood tested. What are their blood types? Enter your answer in its simplest form. 1 mark

A      :    A
1-4      1-6


2. Individual III 3 marries a man with blood type AB, and they have four children. Will any of these children have blood type O? Explain. 1 mark

3. Individuals II 1 and II 2 have a second child. After you see the child’s blood-test results, you know that both parents have the genotype IA i. What blood type is the child? Enter your answer in its simplest form. 1 mark

Answer: ________
                Type