How is O blood type inherited?
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Regarding this, how do you inherit O negative blood type?
If an A or B gene is inherited along with the O gene, the A or B gene determines the person's blood type. A person is type O only if he/she inherits two O genes. You can see that the Rh-positive gene is dominant over the Rh-negative gene. A person's Rh type is negative only if they inherit two Rh-negative genes.
Subsequently, question is, can O positive and O negative have a baby? What happened was that dad and mom each passed both an O and an Rh negative to the baby. The end result is an O negative child. Each of their kids has around a 1 in 8 chance of having O negative blood. This is possible because both O and Rh- are something called recessive traits.
Considering this, can a child have a different blood type than their parents?
While a child could have the same blood type as one of his/her parents, it doesn't always happen that way. For example, parents with AB and O blood types can either have children with blood type A or blood type B. These two types are definitely different than parents' blood types! They will match both parents.
Do Babies always have the father's blood type?
No it doesn't. Neither of your parents has to have the same blood type as you. For example if one of your parents was AB+ and the other was O+, they could only have A and B kids. In other words, most likely none of their kids would share either parent's blood type.