Multiple Alleles – Blood Type

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Presentation transcript:

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 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.

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