Self-sterility in $Nicotiana$ was reported by:

When a gene exists in more than one form,the different forms are called

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:

On which chromosome are the genes for the $ABO$ blood group located?

If one parent has blood group $A$ and the other parent has blood group $B$,what blood groups can the offspring have?

$A$ child with a mother of $B$ blood group and a father of $AB$ blood group will not have which of the following blood groups?