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  4. 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 are possible with this set of alleles?

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Q. 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 are possible with this set of alleles?

KVPYKVPY 2010

Solution:

The given question can be related to human $ABO$ blood group,
where alleles $I^A$ and $I^B$ show codominance and allele 'i; is recessive.
image
Number of genotypes $= 6$
Number of phenotypes $= 4$