Which idea is depicted by a cross in which the $F_1$ generation resembles both the parents?

If two persons with $AB$ blood group marry and have a sufficiently large number of children,these children could be classified as $A$ blood group : $AB$ blood group : $B$ blood group in $1 : 2 : 1$ ratio. Modern techniques of protein electrophoresis reveal the presence of both $A$ and $B$ type proteins in $AB$ blood group individuals. This is an example of:

Define/Explain: Co-dominance.

In which of the following is codominance observed?

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

Alleles which show independent effect are called