I am suggesting here that organisms have a built-I capability of adapting to their environment. I am suggesting that to the extent that evolution occurs, it occurs at the level of the organism. This suggestion differs sharply from the thesis of the NDT, which holds that evolution occurs only at the level of the population. Organisms contain within themselves the information that enables them to develop a phenotype adaptive to a variety of environments. The adaptation can occur by a change in the genome through a genetic change triggered by the environment, or it can occur without any genetic change.

Lee Spetner

Mots clés evolution adaptation neo-darwinism genome environmental-evolution genetic-change phenotypes

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There are many examples where species share common plastic traits. What appears to be convergence may just be the plastic response of the organism to its environment. Examples include the following: Limbs that protrude from an animal’s body have more surface area per unit mass than the rest of the body. In cold weather the animal loses more heat per unit mass from these limbs than from other parts of the body. In many species the tails and legs are shorter for those living in colder climates and larger for those in warmer climates. Gulls’ wings are shorter in cold climates than in warm. Hares and foxes also have shorter ears in cold climates than in warm. Eskimos have shorter arms and legs than do people living in warmer climates. . . . Jodan’s rule: Many species of fish tend to have more vertebrae when they live in cold water than do the same species living in warm water. These differences have been shown to depend on the temperature at which the fish have been reared.
What these rules show is not convergence. They show that different species adopt the same anatomical strategies when they have to cope with the same environmental conditions. We have seen that these strategies cannot come from random mutations. It is much more reasonable to say they come from environmental cues acting on the genetic program.

Lee Spetner

Mots clés evolution neo-darwinism convergence jodan-s-rule plastic-traits

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I myself am convinced that the theory of evolution, especially to the extent to which it has been applied, will be one of the greatest jokes in the history books of the future. Posterity will marvel that so very flimsy and dubious an hypothesis could be accepted with the incredible credulity it has.

Malcolm Muggeridge

Mots clés evolution joke credulity gullibility darwin posterity neo-darwinism closed-mindedness theory-of-evolution

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