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4.Principles of Inheritance and Variation
medium
A gene showing codominance has
A
alleles that are recessive to each other
B
both alleles independently expressed in the heterozygote
C
one allele dominant on the other
D
alleles tightly linked on the same chromosome.
(NEET-2015)
Solution
(b) : The phenomenon of expression of both the alleles in a heterozygote is called codominance. The alleles which do not show dominancerecessive relationship and are able to express themselves independently when present together are called codominant alleles. As a result the heterozygous condition has a phenotype different from either of homozygous genotypes, $e.g.$, alleles for blood group $A\ (I^A)$ and for blood group $B\ (I^B)$ are codominant so that when they come together in an individual, they produce blood group $AB$.
Standard 12
Biology
