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Introduction
Human ABO markers
Blood types and genotypes?
Blood type & Rh factor calculator
Rh factor
Problem set
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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-.
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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-.
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Rh factor
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Possible genotypes
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Rh+
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Rh+/Rh+
Rh+/Rh-
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Rh-
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Rh-/Rh-
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Just like the ABO alleles, each biological parent donates one of their two Rh alleles to their child.
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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).
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| Mother |
Father |
Child |
| Rh- |
Rh+ |
Rh+ |
| Rh- |
Rh- |
Rh- |
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