Three alleles control the ABO blood types. IA and IB are codominant genes, so the combination of IAIB produces the AB blood type. The third allele Iois recessive to the other two alleles. Indicate which of these parents could produce the given child. O A X AB produce B child. O A X O produce A child. O A X B produce O child. O A X AB produce O child. O A X AB produce B child. O B X B produce O child. O AB X AB produce A child.

The ABO blood group represents the phenomena of Co dominance and the multiple alleles.

1. The cross between  O A X AB results in the formation of progeny with the genotype  OA ( A blood group), OB ( blood group), AA ( A blood group) and AB ( AB blood group). Their cross results in the B progeny.

2.  The cross between O A X OO results in the progeny with A blood group ( AO, AO ) and ( OO, OO) and O blood group. Their cross results in the A progeny.

3. The cross between O A X B produce the children with genotype A, B, AB and O if the parent is OB.

4. The cross between O A X AB produces the child with the genotype OA, AA ( A blood group) OB ( B blood group) and AB (AB blood group). No child with O blood type is produced by the parents.

5.  The cross between O B X B produce the children with genotype OO, OB,OB and BB if the parent is OB.

6. The cross between AB X AB results in the progeny with genotype AA ( A blood group) , AB, AB (AB blood group) and BB (B blood group). Their cross results in the progeny with A blood group.

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