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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.
Genes are typically not the only determinants of traits. Although a few traits, such as blood type, are determined strictly by genetics, most traits are influenced both by genes and the environment in which we live.We do not inherit a disease, instead we inherit susceptibility factors that increase risk for a disease.For example, recent studies suggest 50 to 60 percent of alcoholism risk is genetic (National Institute on Alcohol Abuse and Alcoholism). This means the other 40 to 50 percent of the risk is environmental.enes are typically not the only determinants of traits. Although a few traits, such as blood type, are determined strictly by genetics, most traits are influenced both by genes and the environment in which we live.