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Chp. 32 sec. 3

WordDefinition
1.) fertilization the union of a male and female gamete to form a zygote
2.) cleavage in biological development, a series of cell divisions that occur immediately after an egg is fertilized
3.) blastula the stage of an embryo before gastrulation
4.) gastrulation the transformation of the blastula into the gastrula or the formation of the embryonic germ layers
5.) gastrula the embryo in the stage of development after the blastula; contains the embryonic germ layers
6.) archenteron the primitive gastric cavity of an embryo
7.) blastopore an opening that develops in the blastula
8.) ectoderm the outermost of the three germ layers of an embryo that develops into the epidermis and epidermal tissues, the nervous system, external sense organs, and the mucous membranes lining the mouth and anus
9.) endoderm the innermost germ layer of the animal embryo; develops into the epithelium of the pharynx, respiratory tract, digestive tract, bladder, and urethra
10.) mesoderm in an embryo, the middle layer of cells that gives rise to muscles, blood, and various systems
11.) acoelomate an animal that lacks a coelom, or body cavity
12.) pseudocoelom the type of body cavity, derived from the blastocoel and referred to as a "false body cavity," that forms between the mesoderm and the endoderm in rotifers and roundworms
13.) coelom a body cavity that contains the internal organs
14.) protostome an organism whose embryonic blastopore develops into the mouth, whose coelom arises by schizocoely, and whose embryo has determinate cleavage
Created by: sgcook123
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