A man with type A blood marries a woman with type B blood. Their child has type

Question

A man with type A blood marries a woman with type B blood. Their child has type O blood. What are the genotypes of these individuals? What other genotypes, and in what frequencies, would you expect in offspring from this marriage?

Explanation / Answer

Genotype for blood type A-->AA or Ai Genotype for blood type B--> BB or Bi Genotype for blood type 0--> ii AA X BB --> produce no offspring with type O blood only AB blood offspring. Ai x BB--> produce no offspring with type O blood but produce 2 offspring with AB blood and 2 with type B blood. AA x Bi --> produce no offspring with type O blood but produce 2 offspring with AB blood and 2 with type A blood. Ai X Bi --> produce 1 offspring with AB blood, 1 with B blood, 1 with A blood, and 1 offspring with type O blood.

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