How come we have five antigen by rh with only two genes?

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    • #18182
      north3rner
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      I don’t grasp the Rh blood group system. Scanned textbook below.

      50 antigens, lots of combinations (alleles), two genes. Five we care about especially: D, C, c, E, e. "D" defines Rh positive or negative.
      Fine.

      But then textbook says:

      quote :

      Because the Rh alleles are inherited in groups of paired antigens, and each person has two chromosomes for the Rh antigens, each person has a total of five Rh antigens

      Why five antigens ? With two genes and assuming both codominant that would make max four not five.
      And what of two chromosomes? Each gene carried on separate chromosomes ?
      I read somewhere all of it is carried on chromosome 1.

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