If you are Rh negative, it could impact your pregnancy if your baby is Rh positive. If both parents are Rh negative, the baby will be Rh negative.If one parent is Rh positive and the other parent is Rh negative the baby might be positive or negative.If both parents have Rh positive blood, the baby might be positive or negative.However, if both parents are Rh negative, you can be sure the baby will be too. This is because it's possible that both parents carry an Rh negative allele and they might both pass this allele to the baby. Even if both parents are Rh positive the baby can be Rh negative. The Rh factor is inherited on the RHD gene, with the Rh positive allele being dominant. There are eight possible blood types when you combine the ABO groups and the Rh groups: A+, A-, AB+, AB-, B+, B-, O+, and O. If your ABO blood group is O and you are Rh negative, your blood type is O negative. For example, if your ABO blood group is AB and you are Rh positive, your full blood type is AB positive. Positive blood has the Rhesus protein, while negative blood does not. ![]() The Rhesus (Rh) Factor is a protein found on the surface of red blood cells. If they are AO then this reduces to a 50% chance. If they are AA then baby will definitely be AO, and blood group A. In this example, it depends on the genotype of the parent with blood group A - it could be AA or AO. When parents have different blood groups predicting the blood group of baby gets more difficult, as there are more possible combinations. One parent with blood group A and one with blood group O Here the parents have a 25% chance of having a baby with A, 50% chance of AB, and 25% chance of B blood type. The same pattern would be seen with two parents with blood group B. They could be blood group A or blood group O. This means that their children could either inherit two alleles, an A and an O, or two Os. This is the only combination where we can predict with 100% accuracy what blood group baby will have. Two parents with blood group OĪs both the mother and father must have the OO genotype, baby will definitely have blood group O. If you know what blood group you and your partner have, you can make predictions about what blood group your baby will have by looking at some of the possible combinations of alleles. How To Predict Your Baby’s ABO Blood Group This means that it is possible for a baby to have a different blood type than both parents. The actual blood type your baby ends up with depends on gene dominance.įor example, a baby who gets a blood type B allele from one parent and a blood type O allele from the other will end up with blood type B because the B allele is dominant. ![]() Genotype is the genetic code that you can pass on to your children, but not all alleles in your genotype will show up as traits – the phenotype. The two alleles passed on to your baby will make up his genotype. Therefore, both parents influence the blood group of their baby. One ABO allele is inherited from the father (who passes on one of his two) and the other is inherited from the mother (who passes on one of her two). Every person carries two genes, or alleles, for each trait. Inheritance and the ABO GeneĪBO blood type is an inherited trait. 40% have blood group A, 11% blood group B and the remaining 4% have AB blood. Red blood cells in blood type AB have both antigens and those in blood type O have no antigen at all.īlood group O is the most common, with 45% of people in the US having this type. Red blood cells in blood type B have B antigens on their surfaces. Red blood cells in blood type A have A antigens on their surfaces. The ABO system has four major blood groups: A, B, AB, and O. The type of antigens that your blood cells have determine what blood type you have. ![]() There are three types of antigens that determine blood type – A type, B type and Rhesus (Rh). Red blood cells have substances on their surfaces called antigens. The function of these cells is to carry oxygen around the body, but they also determine what blood type you have, whether you are A positive or AB negative for example. Your blood contains a number of different types of cells, including red blood cells. Related: 7 Traits Babies Inherit From Their Mother What is Blood Type? There's no way to be sure what blood type your baby will have without a blood test, but you can narrow down the possibilities if you know your blood type and your partner's. ![]() You might be pondering the question: “What blood type will my baby have?”īlood type is inherited from both biological parents.
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