A child has B blood type. Could a man with AB blood be the father?

Answer 1

Of course. Are you thinking about these problems?

Make a pedigree to see what is and is not possible.

A child with B blood can have BB or BO.
A man with AB blood has alleles AB.
Ask yourself - can the type B child get one of his genes from this man? You can see that the child can get a B from the man.

Are you confused about what alleles make the blood types?

Type O blood - must have OO (or ii).
Type A blood - has AA or AO (or IAIA or IAi)
Type B blood - has BB or BO (or IBIB or IBi)
Type AB blood - has AB (or IAIB)

The alleles A and B are codominant.
A and B are both dominant to O.

Answer 2

yes, if the mother could be AO, AB, BO or O. two genes code for blood type, AB is the presence of both an A and a B, O is the absence of both, AO and BO are types A and B respectively (heterozygous). since the child is B, they could be BB or BO. since we know the father is AB, and he gave the child a B (obviously), that means that the mother either donated another B (making the child BB), or an O (making the child BO). it's most likely that she's an O or and A, especially if the mother is white. 80+% of the white population are either A or O, and 60-80% of most other populations are A or O.

Answer 3

If the guy has AB blood then he resources both alleles for type A and variety B blood, his genotype will be I^a I^b (AB). If the female has type A blood she will both have 2 alleles for type A blood or one allele for type A blood and one allele for type O blood. Her genotype ought to both be I^aI^a (AA) or I^ai (Ao) So certain, they could besides the undeniable fact that it relies upon on no matter if the female is heterozygous or homozygous for type A blood. If she is heterozygous then there's a substitute that she passes on the type O allele and the daddy passes the type B allele, and considering O is recessive then type B blood will be provided in the newborn.

Answer 4

yes, and i'm assuming you want to know why as well? the man has two genes to pass on for blood type, he has an A and a B so if the sperm that fertilizes the mothers egg carries a B gene then the child could be type B blood. this would also mean that the mother would have to passed on a recessive trait(O) or she also could have contributed another dominant B.

Answer 5

yes, the mother could have blood type AB, B or O

Answer 6

Yes, he could. I'm living proof of it. My father has AB blood and my mother has O blood.

Answer 7

YES. Blod type is a codominant characteristic, so genes from both parents express:
Mother _______________Father
(type O)(type O)________(type A)(type B)

Child
(type O)(type B) => expressing type B (phenotype)

The other possbility is that the child would be type A, but never type O nor type AB.

Other case would be:
Mother _______________Father
(type O)(type B)________(type A)(type B)

Child
(type O)(type B) => expressing type B (phenotype)

or
(type B)(type B) => expressing type B (phenotype)

in this case, the child also could be type AB, but never type O.

Answer 8

yes if the mother has B type blood.

Answer 9

Yes, in various combinations with the mother's type, here:

http://www.paternityangel.com/Articles_zone/Blood/BloodType2.htm