Lec 3 - Todays Lecture Lecture Set #3 Main types of...

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1 Lecture Set #3 Main types of cleavage (dictated by yolk!): 1. Holoblastic 2. Meroblastic Orientation of cleavage planes - the Horstadius Experiments Five basic mechanisms of gastrulation - now that we have the cells, what to do? -sea urchins as quick example (vertebrates later) - Back to tunicates: the story of mosaic theory and an example of a cytoplasmic determinant Today’s Lecture Figure 5.2 Role of microtubules and microfilaments in cell division
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2 Figure 5.3 Summary of the main patterns of cleavage (Part 1) Figure 5.3 Summary of the main patterns of cleavage (Part 2)
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3 ZEBRAFISH DEVELOPMENT - MEROBLASTIC (discoidal type) cleavage Figure 5.4 Types of cell movements during gastrulation
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4 Figure 5.7 Micrographs of cleavage in live embryos of the sea urchin Lytechinus variegatus , seen from the side Figure 5.9 Ability of micromeres to induce presumptive ectodermal cells to acquire other fates
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Figure 5.10 Ability of micromeres to induce a secondary axis in sea urchin embryos Figure 5.11
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Lec 3 - Todays Lecture Lecture Set #3 Main types of...

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