ABO blood group has:
1. Two codominant and one recessive allele
2. Two codominant and two recessive allele
3. Two incompletely dominant genes
4. Two pseudo alleles
The ratio of complementary genes is:
1. 9 : 3 : 4
2. 12 : 3 : 1
3. 9 : 3 : 3 : 4
4. 9 : 7
Two nonallelic genes produce the new phenotype when present together but fail to do so independently then it is called:
1. Epistasis
2. Polygene
3. Non-complimentary gene
4. Complimentary gene