TLS Online TPP Program

#Id: 2213

#Unit 11. Evolution and Behavior

Gradualism is Darwin’s proposition that the differences between even radically different organisms have evolved by small steps through intermediate forms,  not by leaps

TLS Online TPP Program

#Id: 2214

#Unit 11. Evolution and Behavior

Populational change is Darwin’s hypothesis that evolution occurs by changes in the proportions (frequencies) of different variant kinds of individuals within a population.

TLS Online TPP Program

#Id: 3162

#Unit 11. Evolution and Behavior

Natural selection was Darwin’s brilliant hypothesis, independently conceived by Wallace, that accounts for adaptations, features that appear “designed” to fit organisms to their environment.

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.