Genetic Assimilation in Natural Selection
It has not been proven that genetic assimilation occurs in natural evolution, but it is difficult to rule it out from having at least a minor role, and research continues into the question. Mathematical modeling suggests that under certain circumstances, natural selection will favor the evolution of canalization that is designed to fail under extreme conditions. If the result of such a failure is favored by natural selection, genetic assimilation will occur. In the 1960s C. H. Waddington and J. M. Rendel argued for the importance of genetic assimilation in natural adaptation as a means of providing new and potentially beneficial variation to populations under stress. Their contemporary Williams argued that genetic assimilation proceeds at the cost of a loss of developmental plasticity, and should be a minor mechanism. If it occurs frequently, genetic assimilation could contribute to punctuated equilibrium in evolution, as organisms repeatedly evolve systems of canalization, then break out of them under adverse circumstances.
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Famous quotes containing the words natural selection, genetic, natural and/or selection:
“Natural selection, the blind, unconscious, automatic process which Darwin discovered, and which we now know is the explanation for the existence and apparently purposeful form of all life, has no purpose in mind. It has no mind and no mind’s eye. It does not plan for the future. It has no vision, no foresight, no sight at all. If it can be said to play the role of the watchmaker in nature, it is the blind watchmaker.”
—Richard Dawkins (b. 1941)
“Nature, we are starting to realize, is every bit as important as nurture. Genetic influences, brain chemistry, and neurological development contribute strongly to who we are as children and what we become as adults. For example, tendencies to excessive worrying or timidity, leadership qualities, risk taking, obedience to authority, all appear to have a constitutional aspect.”
—Stanley Turecki (20th century)
“How wonderful to meet such a natural little girl. She knows what she wants and she asks for it. Not like these over-civilized little pets that have to go through analysis before they can choose an ice cream soda.”
—John Lee Mahin (1902–1984)
“When you consider the radiance, that it does not withhold
itself but pours its abundance without selection into every
nook and cranny”
—Archie Randolph Ammons (b. 1926)