CSB328H1 Lecture Notes - Lecture 2: Chromophore, Notochord, Decarboxylation
15 Sep 2016
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Excellent: one pole of the egg is heavily pigmented. Always goes along the animal vegetal axis. Lots of cells, but they all pretty much look the same, but some are pigmented and some have more yolk, but basically the same. No organs, no differentiated tissues or cells. Cell with yolk divide slower and remain bigger than the cells in the animal pole. Transient structure during development that provides stiffness to the embryo because the embryo does not have any bones yet. Allows maintenance of axes of body: below notochord are the somites which develop later on into muscles, heart is also there. The heart: does not tell us how, but it is a good start, can do experiments on that section of the blastula, find the regions of derivation. Try to figure out what is the fate of certain cells in a blastula.
