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

What is codominance? Explain it in detail with the example of human blood groups.

Which principle is demonstrated by a cross in which the $F_1$ generation resembles both parents?

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:

In cattle,when a cross results in offspring with roan (spotted) coat color,which of the following phenomena is demonstrated?

Write a short note on co-dominance.