Body Classification (E1) Flashcards
1
Q
Radial Symmetry
A
- Usually sessile (living attached to something ex. the ground)
- Meets environment equally from all sides
2
Q
Bilateral Symmetry
A
Allows for complex movement
3
Q
Germ Layers
A
3d layers that form the tissues and organs of the body
4
Q
Diploblastic
A
have two germ layers
5
Q
Triploblastic
A
have three germ layers
6
Q
Ectoderm
A
outermost layer, makes up skin
7
Q
Endoderm
A
innermost layer, makes the digestive tract
8
Q
Mesoderm
A
third layer in between ecto-endoderm, in all bilaterally symmetrical animals
9
Q
Coelom (true coelom)
A
a body cavity composed of only the mesoderm
10
Q
Coelomate
A
animals with a true coelom
11
Q
Pseudo coelom
A
a body cavity comprised of both the mesoderm and endoderm
12
Q
Pseudocoelomate
A
animals with a pseudocoelom
13
Q
Acoelomate
A
animals without a coelom
14
Q
Hox Genes
A
regulate the development and expression of other genes
15
Q
Protostome Development
A
- Spiral cleavage (determinate cleavage)
- Archenteron forms from mesoderm, which splits and forms the coelom
- Blastopore becomes mouth
