Determine if the man could have fathered the following child why or why not.

mother is 0
father is ab
child is o

The man couldn’t have fathered the following child.

Explanation:

The blood grouping system in humans is called ABO blood grouping. The possible blood groups of humans are A,B,AB and O. ABO blood grouping is an example of co-dominance where both alleles of the ABO gene are expressed equally.

The ABO gene has 3 alleles. They are I^A,I^B  and i. the alleles I^A,I^B are dominant over i.  Person with the genotype I^A I^A  and I^A i has the blood group A while a person having the genotype I^B I^B  and I^B i has the blood group B. The person with the blood group will have the genotype  I^A I^B.

Here the mother’s blood group is O which means her genotype is ii. The man’s blood group is AB which means his genotype is  I^A I^B. The possible genotypes of the children are I^A i,I^A i,I^B i,I^B i with respective phenotypes A, A, B and B.  

There is no possibility that the child can have the blood group O which means that the man could not have fathered the child.

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