BIOL 318 Midterm: DB #1
8 Mar 2017
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Zygote = fertilized egg cleavage divides eggs into multiple cells, partitioning of cytoplasm (purposely unequal to set up distinctions) Gastrulation = after cleavage, inward movement of cells (significant event) Ectoderm skin, nerves, outer layer (requires communication w/ mesoderm) Mesoderm middle layer, muscle + skeleton, endocrine glands, kidney, gonads etc. Endoderm inner layer, forms guts, first to invaginate. Rotifer: single cell organism, when eggs are exposed to predators it forms a more defensive shape (posterior lateral spines) Acetabulia: unicellular protest, have cap + stalk + rhizoid, if different caps are transplanted into the nucleus of a denucleated organism forms cap of transplanted species. Naegleria grumberi: if starved they develop flagellum to increase mobility. Directional movement towards cyclicamp anf arranged into anterior. Spends most of life as a free living single amoeboid cell, introduce. If starved early in cell cycle = more pre-stalk. If starved later in cell cycle = more pre spore (which is more.
