Which of the following is an exception to Mendelism?

When two genetic loci produce identical phenotypes in both $cis$ and $trans$ configurations,they are considered to be:

Select the group of $CORRECT$ statements.
$I$. If phenotype of offsprings shows only the dominant trait then the parent plants are heterozygous.
$II$. $A$ true breeding line shows stable trait inheritance and expression for several generations.
$III$. In mendelian experiment material,contrasting characters can be easily recognized.
$IV$. When a single gene controls two (or more) different traits,it is called polygene.
$V$. When interactions occurs between the alleles of different genes present on the same or different chromosome it is called intragenic interaction.

Which of the following is genetically dominant in man?

In a diploid organism,the condition where one of the alleles in a pair is present is called.....

The phenotype of an individual may be affected if the modified allele produces:
$(a)$ No enzyme at all
$(b)$ The normal/less efficient enzyme
$(c)$ $A$ non-functional enzyme