ABSTRACT

The relation o f dominance-recessiveness depends on the interaction between two allelomorphic genes, but interactions o f a similar kind exist between genes belonging to different loci; in fact, all the genes in the genotype probably react with one another during development. We shall discuss the nature o f the reactions in the next chapter: probably they are always reactions between gene-products rather than between genes themselves. Here we shall examine the evidence that such interactions do occur.