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| whereby a single organism-just one parent-produces offspring |
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| meiosis and the formation of gametes typically occur in two prospective parents |
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| this thick fluid has an abidance of proteins and lipids that nourish embryonic stages |
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| during reproduction the egg goes through stages and the blastula is when a ball of cells forms around the egg |
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| in the fourth stage the cells do not divide, they divide and reorganize into a gastrula. It has 2 or 3 primary tissue layers |
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| the outermost primary tissue/germ layer |
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| the innermost germ/tissue layer |
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| forms in between the outer and inner primary tissue layers |
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| a longitudinal series of paired segments that are the source of most bones, skeletal muscles of the trunk and head, and the most of the overlying dermis |
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| consists of paternal DNA and a bit of equipment that helps it reach and penetrate an egg |
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| establishes the anterior-posterior axis |
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| helps seal the developmental fate of each cell lineage |
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| the type of blastula that forms in mammal-the inner cell mass gives rise to the embryo proper |
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| the forerunner of the brain and spinal cord |
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| selective gene expression |
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| some cell lineages express different groups of genes then others do |
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| cell differentiation makes cell lineages become specialized in composition,, structure, and function |
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| tissues and organs of specific proportions, sizes, and shapes form by a program of orderly changed |
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| signaling molecules from some cells activate tools of self-destruction that are stockpiled in others |
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Definition
| the developmental fates of embryonic cell lineages change when exposed to signals-gene products-from adjacent tissues |
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| a sculpting of specialized tissues and organs from clumps of cells in the proper places in the embryo, in the proper order |
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| degradable molecules diffuse out of signaling centers, so their concentration weakens with distance |
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| the products of these genes interact with diverse control elements to lay the foundation for the basic body plan |
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| interact with control elements to map out the overall body plan |
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| caps of DNA and proteins which chromosomes contain |
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