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Development of an embryo-bozemanbiology-Ellie Hawthorne
Development of an embryo
20
Biology
10th Grade
04/16/2012

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Term
Cleavage
Definition
rapid succession of cell divisions that produces a ball of cells (multicellular embryo) from the embryo
Term
blastocoel
Definition
fluid-filled cavity created during cleavage that forms the center of the embryo
Term
Blastula
Definition
hollow ball of cells created by cleavage
Term
gastrulation
Definition
second major phase of embryonic development, which is when cells take up new locations that will allow later formation of organs and tissues
Term
gastrula
Definition
three layered embryonic stage
Term
ectoderm 
Definition
outer layer produced during gastrulation, forms the outer layer skin of gastrula. 
Term
endoderm
Definition
forms embryonic digestive tract  
Term
mesoderm
Definition
partly fills the space between the ectoderm and endoderm, creates skeletal, muscular, circulatory, and reproductive systems
Term
notochord
Definition
extends for most of the embryo's length and provides support for other developing tissues
Term
neural tube
Definition
a tube of ectoderm that becomes the brain and spinal cord
Term
coelom
Definition
body cavity
Term
induction
Definition
the mechanism by which one group of cells influences the development of an adjacent group of cells
Term
programmed cell death/apoptosis
Definition
timely and tidy suicide of cells
Term
pattern formation
Definition
shaping of an animals major body parts
Term
homeotic genes
Definition
class of similar genes that help direct embryonic pattern in a wide variety of organisms
Term
homeoboxes
Definition
nucleotide sequence that is translated into a segment of the protein product of the homeotic gene
Term
gestation
Definition
pregnancy, or the carrying of developing young within the female reproductive tract
Term
conception
Definition
time period from last menstration till baby is born
Term
blastocyst
Definition
hollow sphere of cells formed by the embryo
Term
trophoblast
Definition
outer layer of cells that covers the blastocyst 
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