Biology Question??????????????

The answer your teacher wants is

No. The type A man is not the father of the child. The child got her B blood type allele from the father because she did not get it from the mother who is type O.

==

no, he cannot be the father. if he were blood type AB then he might be the father.

blood type O is recessive in order to have it, you have to get the alleles from both of your parents. People w/ blood type O can only pass on O alleles to their children.

so mom has given the child an O allele and the biological father has given the child a B allele so the child has blood type B. the child's blood type is actually B w/ an O allele. the B is dominant.

the presumed father in your problem has blood type A (either AA or AO). He can only pass on A alleles (AA) or both A and O alleles (AO) to the child.

in your problem the mother is blood type O (OO) and the presumed father is blood type A (AA or AO) these two people can only have a child who is A (A-dad; O-mom) or possibly O (O-dad, O-mom-- O is only true if dad is AO and not AA). but these 2 people cannot have a child who is blood type B--the father is someone else.

Yes just take a dna test to make sure.