Can a child have o positive blood if the mother is A positive and the father is A negative?

Answer 1

Yes. Regarding blood type, each person has two blood group genes--one from each parent. The blood types sort like this: For blood type O: O/O For blood type A: either A/A or A/O For blood type B: either B/B or B/O For blood type AB: A/B Thus two parents who are A/O (and are therefore blood group A) can have a child who is O/O if they both give the O gene, resulting in blood group O. Regarding Rh type, each parent also give one gene, either Rh - or Rh +. An Rh + person can be either +/+ or +/-: and Rh - person is -/-. To summarize: a mother who is A/O and Rh +/- (and thus A positive) and a father who is A/O and Rh -/- (and thus A negative) can have a child who is O/O and Rh +/- (and thus O positive).

Answer 2

No.The Rh factor will match at least one parent.If one parent has a positive and the other has a negative Rh factor then the baby could have either one,but if both parents have the same Rh factor then the baby will have same Rh factor as the parents.

Answer 3

Yes, it's possible. In the ABO system, A and B are dominant over O. A person could be either AA (homozygous, both the same) or AO (heterozygous) and still be an A blood type. Same with B, the person could be either BB or BO. A and B blood types are both rarer than O, so it's pretty likely both parents have one O gene. In that case, their kid could be any blood type.

Since we don't know if the parents are homozygous or heterozygous, these are the overall chances of each ABO blood type:

56.25% chance AB

18.75% chance A

18.75% chance B

6.25% chance O

Rh positive is dominant over Rh negative. A person who is Rh negative has two negative genes (dd). A person who is Rh positive can have either two positive genes (DD) or one positive gene (Dd), and still be Rh positive.

75% chance Rh positive

25% chance Rh negative

So overall, there's about a 5% chance a B negative mother and an A negative father can have an O positive kid. Small chance, but it does happen.

Answer 4

Yes, the father could have both the B and O genes. Since O just means that you don't have the markers for A or B, if a person has either A or B genes in addition to O, only the A or B can be "seen" in the blood type. If the father is BO and the mother is OO (which you have to be to be blood type O), the child could be O positive.

Answer 5

No. The child must be either B-group or O-group; they cannot be A-group.

Answer 6

See chart at link for basics. This is just a chart; physicians will know if there are circumstances that might bring about results other than those expected.

Answer 7

No. A person can only pass on the alleles in his/her genotype. If both parents are O negative, their child cannot be O positive because both parents have only recessive alleles for Rh factor.

Answer 8

No!