A fertilized egg, produced by the joining of a sperm and an egg.(diploid cell-2n)
A developing organism, from fertilization through the first 8 weeks of development.
the organic process whereby a fertilized egg becomes implanted in the lining of the uterus
A solid ball of cells that makes up an embryo; in humans, this stage occurs within four days of fertilization.
The hollow ball of cells marking the end stage of cleavage during early embryonic development
A succession of miotic cell divisions without cell growth between the divisions
In animal development, a series of cell and tissue movements in which the blastula-stage embryo folds inward, producing a three-layered embryo, the gastrula.
Germ layer that gives rise to the epithelial lining of the respiratory and gastrointestinal tracts.
the outermost germ layer that gives rise to the skin and nervous system, including the spinal cord, brain and eyes
germ layer that gives rise to most of skeleton; muscles; circulatory system; reproductive organs; excretory organs
Is the development of a cell from an unspecialized to a specialized state. (caused by gene expression)
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Biology test unit 8
Fertilization and Development
Test 1- Early Embryonic Development
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