Can two sisters have different blood groups?

Question

Father is B+ and Mother is O+. One child is B+ and the other is O+. Is this possible?

Answer 1

It's not only possible, its probable.

Type O means both chromosomes have the O allele (OO), since its a recessive trait. Type B can either be BO or BB, since B is dominant to O. Clearly, the father is BO, b/c if he was BB all the offspring would be type B phenotype.

So its a match of BO and OO, which will produce 50% OO and 50% BO, which means half type B and half type O.

Answer 2

An important issue is the difference between phenotype - how things appear and genotype - the controlling factors or genes involved.
The father appears as blood type B but his controlling factors are the genes for blood type B and blood type O, with O being recessive or "weaker".
The mother is blood group O she has only O genes. It is possible for one of the children to get the B from the father and the O from the mother and have the genes B.O and show blood group B. The other child got O from the father and O from the mother and is blood group O.

Answer 3

Absolutely! Those are the only two possibilities. The blood groups are controlled by one gene that has three different "flavors". Each person has two copies of the gene. So with two copies of the A "flavor" you will be type A. With two copies of the B flavor you will be B. These are dominant flavors, so all you need is one. If you have one copy of B and one copy of A you will be blood type AB. The third flavor is recessive and you need two copies of the recessive flavor to be blood type O.

For one child to be B and the other O, the father has to have one copy of B and one recessive copy.

The + sign is also called the Rh factor and it comes from a bunch of genes. Since mom and dad are +, then it's no surprise that both kids are positive.

Answer 4

Yes this is possible. For a full explanation of blood group inheritance, see:

http://www.purchon.com/biology/abo.htm


Rh factor is dominant/recessive.

Both father and mother are Rh+, so both children inherit at least one Rh+ gene from either parent, and may have inherited both Rh+ genes.

The Mother has no genes for A or B antigen blood.

The father has one B and one O gene, so one child ended up with a B from the father, and O from the mother.

The other child inherited an O from their father and an O from their mother.

O = absence of either A or B antigen gene.

Answer 5

yes this is possible.. because the father and mother are of different blood groups.

Answer 6

Yes, It's entirely possible. The father's blood type may be B, but his genotype would have to be BO though, otherwise all children would have type B blood, as the O allele is recessive.

Answer 7

Yes it is possible. The father would have blood type BO and the mother would have type OO. When their DNA combines, they could have either BO or OO. See punnett square

..... B O
O BO OO
O BO OO

Answer 8

yes one can have mother and the other father

Answer 9

Absolutely.

Answer 10

given the groups supplied its not possable all O blood types are resessive so O is not possable mix unless the father was a Bo carryer then it is possable 50% of the time