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Multiple Alleles Review - in this situation you have more than two alleles that are controlling a single trait. Remember – no matter how many alleles control the trait, we can only ever carry a maximum of two alleles for any trait on our DNA. Example: Human Blood Type – A antigens and B antigens are controlled by dominant alleles (A and B). i represents the recessive allele. Question – what other type of inheritance is demonstrated by the way that the A and B alleles interact? Hint – what happens when you have A and B? (answer at the bottom) Possible Genotypes Possible Phenotypes AA or Ai A blood type BB or Bi B blood type AB AB blood type ii O blood type Example: What is the chance of having a child with B blood type if you have one parent that is homozygous for B blood type and one parent that is heterozygous for A blood type? BB x Ai B B A AB AB i Bi Bi There is a 50% probability of having a child with B blood type. Answer - Co-Dominance