Can a dad with B blood have an o- child?

Answer 1

Yes.

Everyone has two genes actually for blood type, but only the dominant one is expressed.

A and B are dominant over O.

Thus, if you are AA or AO, your blood type is A. If you are BB or BO, your blood type is B.

Because A and B are coequal, if your genes are AB, then your blood type is the (rare) type AB.

The only way you can be blood type O is if you have OO.

If a parent with the genes AO (blood type A) has a child with someone with the genes BO (blood type B), then the baby could get one O from each parent and thus be OO.

Answer 2

Quick answer is it possible

I believe genetics basically have 2 set for each person(confirmed on wiki)

Type B blood can be either BB or BO

So if mother was BO and father is OO then kid can be BO or OO

Think of A and B as salty and sweet and O unflavored...

AA or AO is salty(A)

BB or BO is sweet(B)

AB is salty and sweet(AB)

OO is unflavored (O)

Answer 3

Depends on their genotype. The parents are phenotype B, but they could be genotype BO. With the phenotype of BO, both parents could contribute only the O allele, or to be more specific neither parent would contribute the B allele. Statistically this would happen approximately 25% percent of the time. Statistics are just that. It does not mean that in several sets of parents with the same genotype each one with have a child with blood type O every fourth child. There may be considerable variation.

This answer does not take into account extremely rare and unusual circumstances. It

Answer 4

Yes - this is possible. The father must be heterozygous - meaning BO. If the father is homozygous, BB, then he cannot have a child with O-type blood.