Can a parent with type a positive and a parent with type b positive have a child with o positive blood?

Answer 1

Depending on their genotype this can be possible.

A, B and O refer to the so-called phenotype, which means the actual testable result of genetic information. The genotype on the other hand refers to the actual genetic information of an individual.

There are basically three genes that code the AB0 system, a gene for A, a gene for B and a gene for 0 (actually there are subtypes, but this is not important here).

Everyone has two genes, one on each chromosome of a pair of chromosomes. One gene is inherited form the mother, the other one from the father.

This combination is called genotype. Depending on the combination of genes the four phenotypes are formed. The genotypes are AA and A0 for phenotype A, BB and B0 for phenotype B, AB for phenotype AB and 00 for phenotype 0.

Now to answer the question precisely one would have to know the genotypes of the parents. For example if the parents are genotypes A0 and B0 then the children could have any of the four blood types. The answer would be "yes", as it is possible for the child to to inherit the gene (better a gene) for the positive rhesus factor if both parents have it.

If on the other hand the parents have the genotypes A0/BB, AA/B0 or AA/BB then it is impossible for them to have a child with blood type 0 as no combination would produce the genotype 00 necessary for the phenotype 0.

Conclusion:

It it can be possible. So a child with blood type 0 positive can come from a couple with blood types A positive and B positive. But not all couples with this constellation of blood types will be able to have a child with blood type 0.

Answer 2

Yes.

Let's assume that the rhesus factor (whether the blood is positive or negative) is automatically positive, because both parents are positive.

Parent 1 could have AO, or AA blood to be type A blood.

Parent 2 could have BO, or BB blood to be type B blood.

If we assume that parent 1 has AO blood and parent 2 has BO blood, then their children have a 25% chance of being O type blood, a 25% chance of being B type blood, a 25% chance of being A type blood and a 25% chance of being AB type blood.

A O

B AB BO

O AO OO

Answer 3

Yes, it is possible for two parents with type A positive and type B positive blood types to have a child with O positive blood. This is because blood type O is recessive, so a child can inherit the O blood type allele from both parents even if the parents have different blood types.

Answer 4

No. Parents of those blood types can only have A or O blood types.

Answer 5

yes they can have a child with A pos blood. o group is OO and AB is AB when the two gametes combine they give OA (A positive) and OB( B positive) progeny .