Animal Development - Animal Development I. Sequence of...

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Animal Development I. Sequence of Early Development a. Fertilization b. Cleavage c. Gastrulation d. Organogenesis II. Types of Cell movements a. Invagination/Evagination b. Ingressioni c. Involution d. Epiboly III. Control of Early Development a. Axes b. Germ Layers c. Fate Maps d. Organizers Cells go through a program as they specialize. Determination: progressive restriction of developmental potential. (ex. Early gastrula ectoderm is not determined ventral ectoderm can be transplanted to dorsal surface and form the neural tube but by late gastrula this is not longer possible, even though the cells look the same—they are determined as other tissues) Determination is followed by Differentiation: structural and functional specialization. I. Germ Layers and their Fates: o Ectoderm 1) Epidermis of skin and its derivatives (including sweat glands, hair follicles) 2) Epithelial lining of mouth and rectum 3) Sense receptors in epidermis 4) Cornea and lens of eye 5) Nervous system
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Animal Development - Animal Development I. Sequence of...

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