No, you do not need to know your parents blood type. There is a website (wardsci.com) that sells the supplies to test your own blood type. Although, it would be much cheaper to just have your doctor do it.
It must have one of the true parents blood types.
Yes. The geneotype for both parents must be AO+- for the child to be OO--
A blood type is coded in two parts, one from each parent. To be type B a person can either be BB or BO, while a person with type O must be OO. So for the baby to be type, it must have received an O from both parents. If the parents both have to be type b, then they must both be BO.
The parents must have both blood type B or blood type 0 and B.
Parents must be blood type A or O. Any other blood type will not result in a sole A type child. It might result in several other combinations though, which are not relevant to this question.
To be a universal blood donor one must have O- blood type. A person with this blood type has blood cells with no antigens, so it won't react with other blood types, making it safe for anyone to receive the blood.
Consideration must be given to whether or not the person is Rh positive or Rh negative. A person with blood type A positivecan receive A positive, A negative, O positiveand O negative blood. A person with A negative blood can only receive A negative and O negative blood.
One of the parents must be A or AB, and one must be positive.
A person with phenotype AB blood must have genotype AB blood. Meaning that the person has inherited both A and B alleles.
if both parents have positive o blood their child must have positive o blood
All blood types, depending on what blood type the person need, a label you as a donor.
The gentotype is ii that will produce blood type O. The allele i is recessive, so both parents must have at least one i allele, and the child must be ii (double recessive) to be blood type O. The parents' blood types do not have to be type O- the genotypes Ai (blood type A, as A is dominant), and Bi (blood type B) can produce blood type O offspring, as long as the child inherits the i allele.