Multiple Allele - Blood types

-A number of human traits are the result of more than 2 types of alleles. Such traits are said to have multiple alleles for that trait.
 - Blood type is an example of a common multiple allele trait. There are 3 different alleles for blood type, (A, B, & O). A is dominant to O. B is also dominant to O. A and B are both codominant.


Type O Blood: Universal Donor as it contains no A or B antigens, so the receivers' blood will not clot when given the O blood.
Type AB Blood: Universal Receiver, as it contains no Anti-A or Anti-B antibodies in its plasma. It can receive all blood types.

  
Blood types Homozygous Heterozygous
      A      IA IA        IAi
      B      IBIB        Ibi
      AB 🚫      IA IB
       O  ii 🚫

http://science.halleyhosting.com/sci/soph/genetics/notes/bloodtype.htm

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