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the idea that the egg or sperm contains an embryo - a preformed miniture infant, or "homunculus"
the material substances in the egg that influence the course of early development by regulating the expression of genes that affect the developmental fate of cells
the specialization of cells in their structure and function; dependent on the control of gene expression
the process by which an animal takes shape and the differentiated cells end up in the appropriate locations
a hollow ball of cells- blastula- is created by rapid cell division; the embryo does not enlarge during this period of development.
exocytosis of enzymes from cortical granules in the egg cytoplasm during fertilization
slow block to polyspermy
the formation of the fertilization envelope and other changes in the egg's surface that prevent fusion of the egg with more than one sperm
fast block to polyspermy
the depolarization of the egg membrane within 1-3 seconds after sperm binding to the vitelline layer; prevents additional sperm from fusing with the egg's plasm membrane
vesicles located just under the plasm membrane of an egg cell that undergo exocytosis during the cortical reaction
the hollow ball of cells marking the end stage of cleavage during early embryonic development
the endoderm-lines cavity, formed during the gstrulation process, that develops into the digestive tract of an animal
the opening of thr archenteron in the gastrula that develops into the mouth in protostomes and the anus in deuterostomes
an embryoninc stage in mammals; a hollow ball of cellspreduced one week after fertilization in humans
the innermost of four extraembryonic membranes; encloses a fluiod-filled sac in which the embryo is suspended
one of four extraembryonic membranes; serves as a repository for embryo's nitrogenous waste
a mechanism of cell crawling in which cells of a tissue layer rearrange themselves in such a way that the sheet of cells becomes narrower while it becomes longer
cell adhesion molecules (CAMs)
glyoproteins that contribute to cell migration and stable tissue structure
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