If the father is from type O positive and mother group B can children if they are twins have one negative other negative?

Let's break this down:

* Blood Type: The father is blood type O, and the mother is blood type B.

* Rh Factor: Both parents are Rh positive.

Here's how blood type and Rh factor are inherited:

* Blood Type: Blood type is determined by genes. Each parent contributes one gene. The possible genes are A, B, and O.

* O: A person with blood type O has two O genes (OO).

* A: A person with blood type A can have either AA or AO genes.

* B: A person with blood type B can have either BB or BO genes.

* AB: A person with blood type AB has one A gene and one B gene.

* Rh Factor: The Rh factor is another protein on red blood cells. A person can be either positive (Rh+) or negative (Rh-).

* Rh+: A person with Rh+ has at least one Rh+ gene.

* Rh-: A person with Rh- has two Rh- genes.

Let's look at the possible combinations for the children:

* Blood Type: The father can only contribute an O gene. The mother can contribute either a B gene or an O gene. Therefore, the children could be blood type:

* O: If the mother contributes an O gene (OO).

* B: If the mother contributes a B gene (BO).

* Rh Factor: Both parents are Rh+, meaning they each carry at least one Rh+ gene. This means the children could be Rh+ or Rh-.

Therefore, it's possible for twins to have one child with a negative Rh factor and one with a positive Rh factor.

Important Note: This is a simplified explanation. There are rare blood type combinations that are not covered here. If you have specific concerns, it's always best to consult a medical professional.

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