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Lab3_embryology - Embryology All sexually reproducing...

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1 Embryology All sexually reproducing multicellular organisms begin life as single-celled zygotes and process through – Growth : irreversible increase in size of an organism; – Differentiation : the structural and functional specialization of groups of cells; – Morphogenesis : the development of pattern, shape, and form. Embryology is the study of these processes in the early development of an organism. Early stages of embryology are similar in advanced invertebrates and vertebrates. During development, embryos must overcome Energy requirement – Protection Waste disposal system Different organisms have different adaptations to cope with these problems. Compare features and developmental stages of three earliest stages of development of (1) sea star; (2) frog; and (3) chick. Three early developmental stages studied in this lab: Fertilization : male and female gametes fuse to form a zygote. Cleavage : zygote divides into a larger and larger number of smaller and smaller cells that eventually form a hollow sphere of many cells. Gastrulation : cells of the sphere formed during cleavage continue to divide and move inward to form three cellular layers.
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