Is it possible for siblings to have a different blood type ?

A twin is one of two offspring produced in the same pregnancy. Twins can either be identical (in scientific usage, "monozygotic"), meaning that they develop from one zygote that splits and forms two embryos, or fraternal ("dizygotic") because they develop from two separate eggs that are fertilized by two separate sperm.

The blood group of the first child is B. That means he has two alleles B + O. One allele from the father and another allele from the mother.

The blood group of the second child is O. That means he has two alleles O + O. One allele from the father and another allele from the mother.

One parent has the blood group O and the other parent has the blood group B.

If the children were born as identical twins, they may have the same blood group.

I am pretty sure that two siblings can have different blood types. Blood type O- offspring can only come from an O- parent. Only one parent has to be O-. If the other parent is A+ then the offspring can have A+ or O+ blood. In this case, If one parent is A+ and the other is O- then the only blood types that they can produce is A+.A-, O+ or O-. If neither parent has O- blood then they cant possibly produce an O- child. If the siblings are A+ and O- then the parents MUST have A+.A-.O+ or O- blood.

absolutely possible...umm okay, i dont know if my answer is too technical, but ill try to tell it in simple terms.

Imagine the parents are both of B blood type. Now B blood type could mean that in their genes it could be written as BB or BO (where B is dominant, so even if the person is BO..he/she will have B-blood type and not O-blood type).

Now coming to your query, imagine both the parents are of BO type (like i said before, since B is dominant over O, both will have B blood type)......in such cases the kids could have 3 different blood types:

BB - kid will have B-blood type

BO - again the kid will have B-blood type..exactly like the parents

(or) OO - kid will have O blood type (notice there is no B here, just OO, making O the dominant one)

Hope you got an idea. :)

Yes. It is very possible for siblings to have different blood types. Ex.: Parents both AB, their children would possibly be A, B, or AB.

Yes it is normal, but usually the blood takes after one of the parents.

Yes, I had 3 children and they are all different. I don't remember what there dad was, but I'm B. My kids are A, O and B.Its in the genes.