Term
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Definition
| all parts of the embryo are present in an gamete but are to small and transparent to see |
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Term
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Definition
| fertilized egg contains building blocks only |
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Term
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Definition
| the union of the female and male gamete |
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Term
| morphogenetic determinates |
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Definition
| direct activation and repression of specific genes later in postfertilization development |
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Term
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Definition
| when the nucleus grows rapidly during egg maturation becoming bloated with RNA |
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Term
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Definition
| forms at the point of sperm contact with the vitelline envelope |
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Term
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Definition
| more then 1 sperm entering the egg |
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Term
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Definition
| follows fast block, thousands of enezyme rich granuals fuse with the membrane and release their contents into the space between the membrane and vitiline envelope causing an oosmotic gradient causing water to fill the area lifting the enveloper and exta sperm away from the membrane |
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Term
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Definition
| very little yolk evenly distributed |
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Term
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Definition
| moderate yolk concentrated at the vegetal pole |
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Term
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Definition
| abundance of yolk densely concentrated at the vegetal pole |
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Term
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Definition
| large centrally located mass of yolk |
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Term
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Definition
| the result of clevage subdividing the mass of the zygote untill a cluster of cells is formed |
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Term
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Definition
| the outer layer of cells surrounding the blastocoel |
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Term
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Definition
| organisms with two germ layers |
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Term
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Definition
| pertaining to mesoderm in which embryo has 3 germ layers |
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Term
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Definition
| thrid germ layer formed in the gastrula between the ecto and endoderm |
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Term
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Definition
| the body cavity in triploblastic animals lined with mesodermal peritoneum |
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Term
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Definition
| embryo developes and an anus first and forms a complete gut |
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Term
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Definition
| when the vegetal plate bends inward and extends about 1/3 the way into the blastoceal |
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Term
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Definition
| the blastopore becomes the mouth |
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Term
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Definition
| an animal with out a coelome |
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Term
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Definition
| the fluid filled cavity surrounding the gut |
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Term
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Definition
| earthworms and snails coelome is made by skitizocelie |
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Term
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Definition
| the alteration of cell fates caused by interactions with other cells |
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Term
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Definition
| a tightly condensed 180 base pair sequence, regelatory sequences of protien codes genes that reglate development |
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Term
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Definition
| monophyletic grouping of vertebrates named because the embryos develope in a fluid filled sac |
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Term
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Definition
| the innermost of the extraembryonic memberanes forming a fluid filled sac around the embryo |
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Term
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Definition
| a sac that grows out of the hindgut and serves as a repository for metabolic waste during development |
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Term
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Definition
| lies just below the eggshell and completly encloses the rest of the embryonic systems |
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Term
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Definition
| pouched mamals such as opossumn and kangeroo |
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Term
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Definition
| a foreign transplant that has successfully evolved measures to supress the immune responce that would normally be mounted against it |
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