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This Concept Map, created with IHMC CmapTools, has information related to: Untitled, uneven yolk (more in the vegetal pole) which provides nutrients for embryo, cells different sizes leads blastomeres (determined by cytoplasmic determinates), sperm entry anywhere which causes planes of division to switch, ectoderm forms exoskeleton, symmetry of the egg creates first divsion plane bisecting (perpendicular) the cresent, takes approximately 30 minutes because G1 and G2 phases are eliminated creating a shorter division time, cells get smaller the cytoplasm divides equally, macromeres (4) leads to derm layer endoderm, Fish/Birds contain uneven yolk (more in the vegetal pole), the gray crescent is formed after sperm entry on the animal pole, slows the cleavage due to inhibitory weight causing cells to divide more in the animal pole, bisecting (perpendicular) the cresent which takes approximately 95 minutes (1st division), cell stays the same size because centrally located yolk, Drosophila undergoes synctial division, mesoderm forms organs, planes of division to switch which allows divsions to be synchronous, the animal pole eventually engulfs the vegatal pole, synchronous division and even splitting of cytoplasm, centrally located yolk confines cleavage to cytoplasmic rim, uneven yolk (more in the vegetal pole) and the animal pole