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Codominance: Multiple Alleles & Blood Typing. Codominance & Multiple Alleles. Codominant Alleles – are genes in which both alleles from each parent are expressed equally, they are both dominant. Multiple Alleles – are traits that are controlled by more than two alleles.
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Codominance & Multiple Alleles • Codominant Alleles – are genes in which both alleles from each parent are expressed equally, they are both dominant. • Multiple Alleles – are traits that are controlled by more than two alleles. • Example: ABO Blood Type genes.
Multiple Alleles of Blood Typing • The alleles for blood typing are: IA, IB, and iO • The alleles IA and IB are equally dominant. • The alleles for iO are recessive.
Antigen – foreign substances that stimulate an immune response in the body. For example: Type A blood has Antigen A on the surface of the red blood cells. Antibodies – Proteins in the blood plasma produced in a reaction to antigens that react with and disable antigens.