Identical twins always have the same blood group because they come from the same fertilized egg cell (twins can have different blood groups - even if their parents do - because they are made up of two fertilized oocytes). If linked to another negative gene from a parent with a similar positive-negative gene, that child will be negative even if both parents are positive. Yes, mom or dad can be positive, but the negative-recessive gene is still in their DNA. An A + parent and an O + parent can definitely be O children Can two parents with positive blood have a negative child? Each of their children also has a 3 in 8 chance of A + and a 3 in 8 chance of O +. This means that each child of these parents has an 8 in 8 chance of having a child with blood type O. HereвЂ™s a look at the rarest and most common blood groups by ethnicity, according to the American Red Cross. In general, the rarest blood group is AB negative and the most common is positive. Not all babies have the same 50% maternal DNA and 50% paternal DNA. DNA is not passed down from generation to generation as a single block. So itвЂ™s entirely possible for two siblings to get very different parentage results on a DNA test. Can siblings have different DNA in the same way? For example, if an O gene is linked to an A gene, the blood group is A. Genes A and B are dominant and gene O is recessive. Each biological parent gives their child one of the two в– в– в– genes.

Like the color of our eyes or our hair, our blood type is inherited from our parents. Which parent determines the childвЂ™s blood group the same way? These two groups are very different from the blood types of the parents! They are suitable for both parents.

For example, parents with blood types AB and O may have children with blood type A or blood type B. Can a child have a different blood type from both parents?ДЄlthough a child may have the same blood type as a parent, this is not always the case. However, if the parents have different blood types (any combination of A, B, and O), you can - and likely will see - differences between their childrenвЂ™s blood types. Do Siblings Have The Same Blood Type Can siblings have a different blood type?Д®ach biological parent gives their child one of their two в– в– в– alleles.

How common is a negative blood type