Could two people with positive Rh but different blood types have a baby?
The blood type (A, B, O or AB) and the Rhesus factor are determined by separate genes, even though both are related to the blood. Specifically, each have to do with whether (or not) particular proteins are made and inserted into the cell membrane of the red blood cells. Let’s take blood type first. If no protein is produced, the person is said to have type O blood. If protein A is produced, the person is said to have type A blood. If protein B is produced, the person is said to have type B blood. If both protein A and protein B are produced, the person is said to have type AB blood. AB blood is possible because we have two genes for this characteristic, one inherited from the mother, the other from the father. The information on the gene is called an allele. Thus, a person must have both O alleles to have type O blood, but someone with type A blood could be either AA or AO, and someone with type B blood could be either BB or BO. The Rheusus factor is another gene, but it also codes for
