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Gastrulation

Definition

noun

(embryology) The process in which the embryo develops into a gastrula following blastulation during the early embryonic development of animals


Supplement

An animal embryo undergoes a series of developmental stages. Soon after fertilization, the embryo divides mitotically until it becomes a blastula. The embryonic cells then migrate in complex and coordinated series of cellular movements. One of which is by invagination. The end result is the formation of a gastrula, with three germ layers: ectoderm, mesoderm, and endoderm.


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H2O +Food ---> Zygote

... the fertilized egg cell till the blastocyst stage (the cell is just being divided into individual cells - DNA duplication and cytokinesis). Upon gastrulation, then development needs to have external nutrients.

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by kolean
Sun Jun 20, 2010 11:26 pm
 
Forum: Cell Biology
Topic: H2O +Food ---> Zygote
Replies: 7
Views: 3979

The Mule Theory.

... the same biochemicals the sperm can not penetrate the oocyte for fertilization to even have a chance to begin. Then there is all the cleavage and gastrulation, which have to be in sync also. Not all donkey sperm that fertilize a horse oocyte make it thru embryology. It has to be the right combination ...

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by kolean
Sat Dec 26, 2009 9:39 pm
 
Forum: Evolution
Topic: The Mule Theory.
Replies: 8
Views: 5333

Could animal sperm fertilize a human egg?

... not instantaneously abort. In sea urchin, polyspermy does not result in "instantaneous abortion" and development can continue through gastrulation (cf. Boveri). This development occurs even though 2(+) asters are introduced into the egg, which royally f***s up the partitioning of chromosomes ...

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by snowcapk
Sat Apr 12, 2008 2:01 am
 
Forum: Molecular Biology
Topic: Could animal sperm fertilize a human egg?
Replies: 5
Views: 13747

embryonic development in a chick

Can anyone please help me out..I just cant understand this gastrulation stage ...my book's too confusing..can't understand how the hypoblast forms the yolk sack? and what exactly are area pelucidia and area opaca? cant understand primitive streak as well ...

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by cracked_doc
Mon Feb 04, 2008 7:40 pm
 
Forum: Zoology Discussion
Topic: embryonic development in a chick
Replies: 3
Views: 2728

Embryo Development

zygote, blastula, morula, gastrula, embryo gametogenesis fertilization blastulation gastrulation neurulation= only in Chordates organogenesis Hope this helps.

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by Volvox
Thu Mar 22, 2007 3:18 am
 
Forum: Human Biology
Topic: Embryo Development
Replies: 8
Views: 5765
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