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For centuries the relative effects of nature (genetics) and nurture (environment) on an organism's development have been debated. Gene control systems (promoters) may be more important than the gene products (proteins) themselves. Chimps have bigger jaws than humans because the (same) jaw-growing gene is turned on in chimpanzee fetuses for longer than in human fetuses. In contrast, a "gene for schizophrenia" may not exist. More likely, the syndrome is caused by a variety of genetic abnormalities (physical gene differences), ...Log In or Sign Up to Read More