The Rh factor
The Rh factor genetic information is also inherited from our parents, but it is inherited independently of the ABO blood type alleles. There are 2 different alleles for the Rh factor known as Rh+ and Rh-.
Someone who is "Rh positive" or "Rh+" has at least one Rh+ allele, but could have two. Their genotype could be either Rh+/Rh+ or Rh+/Rh-. Someone who Rh- has a genotype of Rh-/Rh-.
Rh factor | Possible genotypes |
Rh+ | Rh+/Rh+ Rh+/Rh- |
Rh- | Rh-/Rh- |
Just like the ABO alleles, each biological parent donates one of their two Rh alleles to their child
A mother who is Rh- can only pass an Rh- allele to her son or daughter. A father who is Rh+ could pass either an Rh+ or Rh- allele to his son or daughter. This couple could have Rh+ children (Rh- from mother and Rh+ from father) or Rh- children (Rh- from mother and Rh- from father).
Mother | Father | Child |
Rh- | Rh+ | Rh+ |
Rh- | Rh- | Rh- |
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