Nurturing Life Sciences
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#XL - T Zoology
Mutationist - Theories were advanced by some geneticists who observed that discretely different new phenotypes can arise by a process of mutation.
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Ronald A. Fisher, John B. S. Haldane and Sewall Wright- which showed that mutation and natural selection together cause adaptive evolution.
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Theory of recapitulation - Ernst Haeckel
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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).
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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