Who was the scientist to introduce $ABO$ blood groups

When a plant of $F_1$ generation is crossed with homozygous dominant parents, it is known as

In Drosophila, the sex is determined by

Epistasis and dominance are respectively

If mother and father both are without pigments $(albinism)$, then

When an allele fails to explain itself in presence of the other allele, the former is said to be