How many phenotypes are possible in human 'ABO' Blood group?

How many phenotype and genotypes are possible for ABO blood groups ?

How many phenotype and genotypes are possible for ABO blood groups ?

How many phenotypic classes are found for human blood group in population ?

How many genotypes and phenotypes are present in ABO blood group system ?

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

How many genes are responsible for? ABO system of blood group.

How many genes are responsible for (a) ABO system of blood group.

Which of the followings is/are correct for the inheritance of genes involved in human ABO' blood grouping?

How many genes are responsible for? (i)ABO system of blood group (ii)Skin colour in human