Genetic determinism is the belief that genes, along with environmental conditions, determine morphological and behavioral phenotypes. The term is sometimes mistakenly applied to the unscientific belief that genes determine, to the exclusion of environmental influence, how an organism turns out. As CH Waddington wrote in 1957, "It is of course a truism which has long been recognised that the development of any individual is affected both by the hereditary determinants which come into the fertilised egg from the two parents and also by the nature of the environment in which the development takes place." A related error is that geneticists and molecular biologists have only recently come to the realization that environment is essential in the development of the organism from egg to adult. In fact theorists and researchers long ago understood that genetic effects cannot be studied in isolation of the environment and that all measurements of such effects are only relative to stable external conditions. Also known since at least the 1950s is the means by which the environment influences embryonic and juvenile development, namely the epigenetic control of gene activation and deactivation.
Read more about Genetic Determinism: Origins, The Machine Theory, Developmental Genes, The Modern Synthesis, Crick and Watson, The Contemporary View, In Fiction
Famous quotes containing the words genetic and/or determinism:
“What strikes many twin researchers now is not how much identical twins are alike, but rather how different they are, given the same genetic makeup....Multiples don’t walk around in lockstep, talking in unison, thinking identical thoughts. The bond for normal twins, whether they are identical or fraternal, is based on how they, as individuals who are keenly aware of the differences between them, learn to relate to one another.”
—Pamela Patrick Novotny (20th century)
“Old-fashioned determinism was what we may call hard determinism. It did not shrink from such words as fatality, bondage of the will, necessitation, and the like. Nowadays, we have a soft determinism which abhors harsh words, and, repudiating fatality, necessity, and even predetermination, says that its real name is freedom; for freedom is only necessity understood, and bondage to the highest is identical with true freedom.”
—William James (1842–1910)