If both parents are blood type A can they have a child with a blood Type O?

Answer 1

We are looking for the possible blood types of a baby.

Parental information:

• Mother type B --can be BB or BO = Genes to contribute: B, O
• Father type A --can be AA or AO = Genes to contribute: A, O

Baby receives one gene from each parent:

• Baby is type AB = Type AB
• Baby is type AO = Type A
• Baby is type BO = Type B
• Baby is type OO = Type O

YES, if one parent is Type A and the other Type B, they might be able to have a Type O baby.

Answer 2

Yes. Blood type is based on two alleles, so your mother with type A (A- = type A with Rh-negative), she could be AA or AO. Similarly, your father could be BB or BO, since both combinations would result in blood type B. It's kind of like holding 2 envelopes with directions for cooking a certain recipe. BB would be like holding 2 envelopes with the same B recipe. BO would be like holding one envelope with the B recipe and another envelope that's empty. You can make B either way.

Let's say that it turns out that the mom is AO and the father is BO. They each give their children one of their two alleles, randomly, each time they have children. If it turns out that both happen to give the O allele, then the child would be OO, which would be blood type O. That's the only way you can get blood type O.

If the mother is AA and/or the father is BB, then this won't work. They both have to have an O allele.

Answer 3

We are looking for the possible blood types of a baby.

Parental information:

• Mother type A -- can be AA or AO = contributes A or O gene
• Father type A -- can be AA or AO = contributes A or O gene

Baby receives one gene from each parent:

• Baby is type AA = Type A
• Baby is type AO = Type A
• Baby is type OO = Type O

IF both parents are heterozygous Type A (AO), then there is a 25% chance that the offspring will be Type O (OO). However, if one or both of the parents are homozygous Type A (AA), then there is zero chance for a Type O baby.

HOWEVER: There is more to ABO blood typing that just the ABO gene.

There is also an inhibitory gene that will change any genotype into the phenotype O.

Therefore a person with genetically AB blood can be tested as having Type O.

If the baby's inhibitory gene has been turned "on", then no matter what ABO genes he receives from his parents, he will test out as a Type O.

Answer 4

Yes, it is possible for two parents with blood type A to have a child with blood type O. This can occur if both parents are carriers of the O gene and pass it on to the child. Blood type O is recessive, so both parents must carry at least one O gene for the child to have blood type O.

Answer 5

No. A motherr with type A blood and a father with type B blood cannot have a child with type O blood. One of the parents must have type O blood.