Theory of embryology - theory of epigenesis, Biology

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THEORY OF EPIGENESIS -

It was propounded by C. F. Wolff and supported by Von Baer.
According to it, the egg contains the substances which are required in the formation of animal. These substances form layers during the development.
William Harvey given the word epigenesis. According this embryo is formed from fusion of male and female gamete.
According this serial development is from simple to complex.

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