What happens if two parent with o positive blood types have a child with b negative blood type?

Not possible. It is possible for the child to be rH negative if both parents are hybrid rH positive (one positive and one negative rH gene), but if they are both type O can only have type O children. Either one of them is not the biologic parent, or someone's blood typing is a mistake. Someone had to give that B gene.

Related Questions

If my husband blood type is b negative and my blood type is o positive what will the baby blood type be?

Not A. think of O as a blank. Each person has two genes that can be A, B or O (blank). the Combinations of AO and BO act as A and B. The baby is getting a BLANK from you. and might get either a B or a O from dad... so... could be either BO or OO so... B or O .. but not A.... Might be either negative or positive but cannot be a problem because YOU won't attack your own positive. Read more...
B or O. B- father with O+ mother can have multiple blood type possibilities for the following offspring blood types: Heterozygous O+/O- mother and B- father: B+, B-, heterozygous O+/O- (phenotype O+), homozygous O-/O- (phenotype O-). Homozygous O+/O+ mother and B- father: B+, and heterozygous O+/O- (phenotype O+). Hope this helps. Read more...
It can be either. B or O, positive or negative, depending on which 2 genes you both carry. Your husband may have 2 B genes, or a B and an O gene. You may have two positive genes or a positive and a negative gene. B+O would equal B, O+O would equal O. Negative + negative = negative, while negative + positive = positive. It depends on what you both carry and what you pass on! Read more...
Depends. Assuming you and your husband are the biological parents, your baby could have several possible types - B +, B -, O+, or O -. If you used donor eggs, donor sperm, or had a donor embryo implanted, the baby could have, literally, any blood type, based on the blood types of the biological mother and father. Read more...

Is it possible to have both parents with o positive bloodtype, but their child have o negative blood type?

Yes. The rh factor is inherited through separate genetic means from the blood type. The rh factor is a dominant gene, meaning only one gene is needed to cause expression of the factor. So two rh + parents can have a rh+/rh- gene pattern and have a 1/4 chance with every conception of having an rh-/rh- baby, 1/4 chance of rh+/rh+ baby and 1/2 of carrier rh+/rh-. Read more...
See below. The transmission of the rhesus factor is not directly related to the ABO type. This means that the child could end up being negative. Read more...