Which of the following is an example of multiple allelism?

How many of the following genotypes possibly represent normal wings in Drosophila?
$(i)$ $Vg^{+} Vg^{+}$
(ii) $Vg^{+} vg^{ni}$
(iii) $Vg^{+} vg^{no}$
(iv) $Vg^{+} vg^{st}$
$(v)$ $Vg^{+} vg$

The plasma membrane of the red blood cells has ...$A$... polymers that protrude from its surface and the kind of sugar is controlled by the gene. The gene $I$ has three alleles ...$B$... The alleles and produce a slightly different form of the sugars,while allele $i$ doesn't produce any ...$C$...
Choose the correct option for $A, B$ and $C$.

In humans,four phenotypes of blood groups are due to the presence of antigen-$A$ and antigen-$B$ on the $RBC$. The chromosome that carries the gene controlling these antigens is:

Explain Multiple Alleles and the concept of Dominance with an example.

$A$ child of $O$ blood group has a $B$ blood group father. The genotype of the father will be: