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Multiple Alleles – Blood Type

Multiple Alleles – Blood Type. Blood Types - Multiple Alleles and Co-dominance In humans, there are four blood types (phenotypes): A, B, AB, and O Blood type is controlled by three alleles. A, B, O O is recessive, two O alleles must be present for the person to have type O blood

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Multiple Alleles – Blood Type

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  1. Multiple Alleles – Blood Type

  2. Blood Types - Multiple Alleles and Co-dominance • In humans, there are four blood types (phenotypes): A, B, AB, and O • Blood type is controlled by three alleles. A, B, O • O is recessive, two O alleles must be present for the person to have type O blood • A and B are co-dominant. If a person receives an A allele and a B allele, their blood type is type AB • Crosses involving blood type often use an I to denote the alleles - see chart.

  3. Rh (Rhesus) Factor • Simple Dominance Trait of an additional RBC surface antigen • R = Produces the protein • r = does not produce the protein • Rh+ = RR & Rr • Rh- = rr

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