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The genotypes of a husband and wife are IAIB and IAi. Among the blood types of their children, how many different genotypes and phenotypes are possible?

1. 3 genotypes; 4 phenotypes
2. 4 genotypes; 4 phenotypes
3. 4 genotypes; 3 phenotypes
4. 3 genotypes; 3 phenotypes

Correct answer: 4 genotypes; 3 phenotypes

Solution

The IAIB parent can produce IA or IB gametes, while the IAi parent can produce IA or i gametes. Combining them gives four possible genotypes, but two of those produce the same blood type, so there are only three phenotypes.

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