5 lecture ZOO NEW

5 lecture ZOO NEW - Conditional specification Interactions...

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Conditional specification Interactions with neighboring cells interactions restrict fate regulative development – 4 division blastomere separated and still grew in an independent organism Characteristic of vertebrates Cleavages produce no invariant fate assignment Relation positions important Massive rearrangements precede specification – foundation in process of gastrulation
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The Germ Plasm theory August Weismann (1893) 1. Sperm and egg contribute equally 2. Chromosomes carry inherited potential (determinants) 3. Not every determinant inherited by all cells (differential distribution) 4. Only cells with all determinants are those destined to become germ cells this theory does not account for the environment, all cells have the same DNA
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Theory of cell inheritance
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Testing the Hypothesis Fate maps - separation of blastomeres would result in left and right half determinants Four Experimental techniques 1.
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