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Histones are spools of proteins that surround the chromosome and control the switching on of genes. National Human Genome Research Institute. Changes made to the protein spools that surround chromosomes are passed down generations, proving that inherited traits are decided by more than just DNA, says a new study.
Because their effects add up to influence the phenotype. When genes interact additively, the phenotype usually reflects the contributions of every gene that is involved. Height, hair curliness, skin color, are usually the result of additive genes. Dominant-recessive genes are nonadditive, the dominant gene usually controls the characteristic even when a recessive gene is the other half of a pair.