Blood typing is an example of this where there is one gene but one gene can have several different characteristics

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Alisa Bauer

Biology

2 July, 15:14

Blood typing is an example of this where there is one gene but one gene can have several different characteristics

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Gabriela Downs · Answer 1

Blood typing is an example of codominance.

The blood type is controlled by a single gene (I gene) which has three alleles A, B and i.

The IA allele gives type A,

IB gives type B, and

i gives type O.

Individuals with IAIA or IAi have type A blood, and individuals with IBIB or IBi have type B. IAIB people have both phenotypes, they express codominance (characteristics of both alleles expressed). ii genotype is for O blood group.