A couple has four children with blood groups | vedclass

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(D) The blood groups of the children are $A, AB, A,$ and $O$.For a child to have blood group $O$ $(ii)$,both parents must contribute an $i$ allele. Th

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$I^A i$ and $I^B i$

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(D) The blood groups of the children are $A, AB, A,$ and $O$.For a child to have blood group $O$ $(ii)$,both parents must contribute an $i$ allele. Thus,both parents must be heterozygous.For a child to have blood group $AB$ $(I^A I^B)$,one parent must contribute $I^A$ and the other must contribute $I^B$.Combining these requirements,the parents must have genotypes $I^A i$ (Blood group $A$) and $I^B i$ (Blood group $B$).Cross: $I^A i 	imes I^B i$ results in offspring with genotypes $I^A I^B$ $(AB)$,$I^A i$ $(A)$,$I^B i$ $(B)$,and $ii$ $(O)$.Since the children include $A, AB,$ and $O$,the parents must be $I^A i$ and $I^B i$.

$A$ couple has four children with blood groups $A, AB, A,$ and $O$ respectively. What are the genotypes of the parents' blood groups?

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