BIOL 303 Lecture Notes - Lecture 2: Blastula, Cyclin B, Blastocoel

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Cleavage: period of rapid cell division of the egg cytoplasm that forms blastula. It"s a series of mitotic division of the egg cytoplasm that form nucleated cells, known as the blastula. Blastomere: a cell produced from cleavage through mitosis. Blastula: an early staged embryo that is made up of sphere shaped cells that surround an inner fluid-filled cavity known as the blastocoel. Blastulation: it is the stage in embryonic development in which the blastula is formed right after the morula stage and then proceeds to gastrulation. Microlecithal: very little amount of yolk in the haloblastic cells, formation of complete and separated cells. Mesolecithal: moderate amount of yolk in the haloblastic cells. Centroecithal: yolk in the centre of the egg in the meroblastic cells, which are incomplete separated cells. Teloecithal: yolk at one end of the meroblastic cells, which are incomplete separated cells. Holoblastic cleavage: is the formation of complete and separated cells, this consist of very little yolk.

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