Regulation of TH1 and TH2 subset differentiation

TLS Online TPP Program

#Id: 3163

#Unit 11. Evolution and Behavior

 Orthogenesis- “Straight-line evolution,” held that the variation that arises is directed toward fixed goals.

TLS Online TPP Program

#Id: 3164

#Unit 11. Evolution and Behavior

Mutationist- Theories were advanced by some geneticists who observed that discretely different new phenotypes can arise by a process of mutation.

TLS Online TPP Program

#Id: 3165

#Unit 11. Evolution and Behavior

Ronald A. Fisher, John B. S. Haldane and Sewall Wright- which showed that mutation and natural selection together cause adaptive evolution.

TLS Online TPP Program

#Id: 3166

#Unit 11. Evolution and Behavior

 Neutral theory of molecular evolution- Developed by Motoo Kimura, who argued that most of the evolution of DNA sequences occurs by chance (genetic drift) rather than by natural selection.

TLS Online TPP Program

#Id: 3167

#Unit 11. Evolution and Behavior

Theory of recapitulation - Ernst Haeckel
He proposed that the embryonic development of an individual organism (its ontogeny) followed the same path as the evolutionary history of its species (its phylogeny).

TLS Online TPP Program

#Id: 4307

#Unit 11. Evolution and Behavior

Bergmann’s rule: populations in colder climates tend to have greater body mass than those

in warmer climates. This pattern is so common that it has a name.