Mendel's law is not applicable in which of the following cases?

What is the phenomenon called where factors produce independent effects in their heterozygous condition?

Codominance is shown by the gene controlling:

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

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:

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