Question

5. Mary has blood type A and she marries John , whose blood type is B. They have three
children: Joan. James and Pete. Joan has blood type 0, James has blood type A, and Pete has
blood type B. Explain how this is possible.

Answer 1

Answer:

Mary's genotype must be IAi while John's must be IBi. When the gametes met up at each conception, Joan got ii, James got IAi, and Pete got IBi.

Explanation: