When both alleles of a pair are fully expressed in a heterozygous condition,it is called $:-$

The $AB$ blood group exhibits which of the following phenomena?

When two genes with independent expression are present together, they both express their characteristics, and when they are separate, they express their individual characteristics. This phenomenon is observed in which of the following?

All of these obey Mendel's laws except:

In a gene showing codominance,the alleles:

In short-horned cattle,genes for red $(R)$ and white $(r)$ coat colour occur. $A$ cross between red $(RR)$ and white $(rr)$ produces $(Rr)$ roan. This is an example of: