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| Embryonic Development |
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| All the events which change a zygote into a fully developed organism is called embryonic development. The entire process of development is called embryogenesis. Von Bear is called the "Father of Modern Embryology". |
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| Embryonic Development includes a definite series of fundamentally similar sequence of events. It includes |
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 Gametogenesis - Formation of gametes |
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 Fertilisation - Fusion of male and female gamete to form zygote. |
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 Cleavage - Division of zygote by mitosis to form a hollow blastula. |
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 Gastrulation - Movement and rearrangement of embryonic cells to form three primary germinal layers. |
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 Organogenesis - The formation of specific organ systems from the three germinal layers. |
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