Amount of change in allele frequency

                        

frequency of G2 will increase and the  frequency of G1 will decrease                      frequency of G1 will increase and the frequency  of G2 will decrease

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#Id: 7043

#XL - T Zoology

Where, though, do these hereditary variations come from? This was the great gap in Darwin’s theory, and he never filled it.

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#Id: 7044

#XL - T Zoology

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

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#Id: 7045

#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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#Id: 7046

#XL - T Zoology

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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#Id: 7047

#XL - T Zoology

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. 

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#Id: 7048

#XL - T Zoology

Theory of recapitulation - Ernst Haeckel