AP biology ch 32 2/4
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Created by:
PaolaBenefo on January 31, 2012
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9 terms
Terms | Definitions |
|---|---|
 bilateria | Group of animals with bilateral symmetry |
| mesoderm | The middle embryonic germ layer, lying between the ectoderm and the endoderm, from which connective tissue, muscle, bone, and the urogenital and circulatory systems develop. |
| diploblastic | Derived from two embryonic germ layers, the ectoderm and the endoderm. Lacks true mesoderm. |
| triploblastic | Having three germ layers. Used of the vertebrate embryo. |
| acoelomates | An animal that lacks a coelom. Acoelomates, which include the flatworm, fluke, tapeworm, and ribbon worm, exhibit bilateral symmetry and possess one internal space, the digestive cavity. |
| archenteron | The central cavity of the gastrula, which ultimately becomes the intestinal or digestive cavity. |
| spiral cleavage | Characteristic of protostomes where cell division changes it from a four-cell embryo to an eight-cell embryo, the cells divide such that each cell in the top four cell plane is at an angle to the opposite cell in the bottom plane. |
| determinate cleavage | cleavage of an egg in which each division irreversibly separates portions of the zygote with specific potencies for further development |
| radial cleavage | Characteristic of deuterostomes where cell division changes it from a four-cell embryo to an eight-cell embryo, the cells divide such that each cell in the top four cell plane is directly over one other cell in the bottom plane. |
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