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A man with type a blood whose mother was type o is married to a women with type ab blood what are the blood types of their children and in what proportion

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mathmate
Establish genotype/phenotype table
Genotype Phenotype
     oo            type O
     AB           type AB
     Ao           type A
     Bo           type B

So if parents' phenotypes are O and AB, then we can construct the Punnett square:

        O       O
A     AO     AO
B     BO    BO

So we conclude that the offsprings have phenotypes and proportions
type A  (AO) 50%
type B  (BO) 50%