The genotypes of a husband and wife are I A I B and I A i. Among the blood types of their children, how many different genotypes and phenotypes are possible?

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If the genotypes of husband and wife are I A I B and I A i respectively, then the probabilities of genotypes and phenotypes among their children can be worked out as: Genotype: I A I A ; I A i; I A I B ; I B i. Phenotype: A:AB: B :: 2:1:1. Thus, there are four possible genotypes and three possible phenotypes among the children.

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