How many different phenotypes are possible in a one gene/three allele system that displays codominance to each other?

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Jasper Smith

Biology

14 March, 13:06

How many different phenotypes are possible in a one gene/three allele system that displays codominance to each other?

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Rebecca · Answer 1

Six phenotypes are possible in a one gene/three allele system that displays codominance to each other with three alleles, a1, a2, a3.

3 homozygous and 3 heterozygous combinations. Each unique combination of two alleles results in a distinct phenotype. Possible combinations are:

a1/a1

a1/a2

a1/a3

a2/a2

a2/a3

a3/a3