In a diploid organism, there are three different alleles for a particular gene. Of these three alleles, one is recessive and the other two alleles exhibit codominance. How many phenotypes with this set of alleles?

1 Answer
Oct 25, 2017



This problem is similar to the problem of blood types. In blood types there are three possible alleles. Two are codominate A and B. One is recessive O . These results in four possible phenotypes


AA = A

AO = A

BB = B

BO = B

OO = O

This gives four possible phenotypes.