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Gerardo Glover

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What is expressed when both alleles for a gene are equally expressed as in human blood type

This is called co-dominance. This is when 2 or more alleles are expressed at the same time. In other words they both affect the phenotype. In the example of human blood ABO type we have an allele for A = IA, B= Ib O=i

IAIb = AB blood type

IbIb = B blood type

Iai = A

IaIa = A bloody type

Ibi = B blood type

ii = O blood type

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