ABO blood group in man is controlled by

How many possible genotypes are there for the ABO blood group which are controlled by three multiple alleles ?

In human beings, 'ABO' Blood group is controlled by which gene ?

In human beings, 'ABO' Blood group is controlled by which gene ?

ABO blood group is based on:

In human ABO blood group system,there are six possible genotypes but only four phenotypes.An explanation of this is that the ABO blood groups are controlled by

ABO blood group have :

ABO blood group have :

ABO blood grouping shows

ABO blood group in human is an example of