Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
18 Cards in this Set
- Front
- Back
|
cleavage
|
succession of mitotic cell divisions without cell growth between division cycles.
|
|
|
blastula
|
A multicellular stage in which animals take on the form of a hollow ball.
|
|
|
gastrulation
|
Layers of embryonic tissues that will develop into adult body parts are produced.
|
|
|
gastrula
|
The deveopmental stage of gastrulation
|
|
|
larva
|
A free-living, sexually immature form in some animal life cycles that may differ from the adult in morphology, nutrition, and habitat.
|
|
|
radial symmetry
|
Characterizing a body shaped like a pie with many equal parts radiating outward
|
|
|
bilateral symmetry
|
Characterizing a body form that divides into two equal but opposite halves
|
|
|
cephalization
|
An evolutionary trend toward the concentration of sensory equipment on the anterior end of the body
|
|
|
dorsal vs. ventral
anterior vs. posterior |
top/bottom
head/tail |
|
|
What are the 2/3 germ layers that form the various tissues and organs of the body?
|
Endoderm
Ectoderm (1+2 = Diploblastic) Opt: Mesoderm (Triploblastic) |
|
|
Ectoderm
|
Body covering of the organism and gives rise to the central nervous system in some phyla.
|
|
|
Endoderm
|
* Innermost Germ layer
* Gives rise to lining of digestive tract and organs derived from it |
|
|
What is a coelom?
|
A Fluid-filled space separating the digestive tract from the outer body wall.
|
|
|
Coelomates?
|
Animals with a true coelom
|
|
|
Pseudocoelmate
|
Have a body cavity only partially lined by tissue derived from mesoderm
|
|
|
Acoelomates
|
Lack a body cavity between digestive cavity and outer body wall
|
|
|
3 features of protosome development
|
1) Spiral and determinate
2) Schizocoelous: solid masses of mesoderm form coelom 3) Mouth develops from blastopore |
|
|
3 features of deuterostome development
|
1) Radial and indeterminate (each individual cell can develop into a complete different embryo)
2) Enterocoelous: Folds of archenteron (inner digestive tube) form coelom 3) Anus develops form blastopore |
