Three children in a family have blood types O | vedclass

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(A) To have a child with blood type $O$ (genotype $ii$),both parents must contribute an $i$ allele. Therefore,both parents must be heterozygous.To hav

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

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(A) To have a child with blood type $O$ (genotype $ii$),both parents must contribute an $i$ allele. Therefore,both parents must be heterozygous.To have a child with blood type $AB$ (genotype $I^A I^B$),one parent must contribute $I^A$ and the other must contribute $I^B$.To have a child with blood type $B$ (genotype $I^B i$ or $I^B I^B$),the parents must possess the $I^B$ allele.Combining these requirements,the parents must have genotypes $I^A i$ and $I^B i$. - Parent $1$ $(I^A i)$ can produce gametes $I^A$ and $i$.- Parent $2$ $(I^B i)$ can produce gametes $I^B$ and $i$.- Possible offspring genotypes: $I^A I^B$ (Type $AB$),$I^A i$ (Type $A$),$I^B i$ (Type $B$),and $ii$ (Type $O$).Thus,the parents' genotypes are $I^A i$ and $I^B i$.

Three children in a family have blood types $O$,$AB$ and $B$ respectively. What are the genotypes of their parents?

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