20. A woman has type O blood and her husband has type AB blood. Is it possible for them to have children with the same blood type as their parents?

21. Can a man with type B blood and a woman with type A blood have a child with type O blood?

22. Cross a man that is heterozygous type A and a woman that is homozygous type B. What percentage of their children will be type AB?

23. Which of the following genotypes results in the same phenotype?
a. IAIA and IAIi c. ii and IBi
b. IAIB and IAIA d. IAIB and IAIA