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;
23 Cards in this Set
- Front
- Back
|
Characteristics of animals
|
ingesting heterotrophs
multicellular eukaryotes Specialized cells or tissues |
|
|
eight-cell stage
|
clevaging of zygote
*Spiral and determined in Protpstome *Radial and indeterminant in Deuterostome |
|
|
Blastula
|
Multicellular hollow ball
|
|
|
Gastrulation
|
embryonic layers/ tissues specialize results in gastrula
Blastopore (gastrula opening), archenteron( hollow inside), ectoderm, ectoderm |
|
|
Hox gene
|
DNA sequence that influences animal morphology
|
|
|
Cambrian Explosion
|
wave of animal diversification, 535-525 mya
|
|
|
Radial Symmetry
|
same symmetry as a circle
|
|
|
Bilateral symmetry
|
two axes of orientation along one line of symmetry
|
|
|
Dorsal
|
top
|
|
|
Ventral
|
bottom
|
|
|
anterior
|
front
|
|
|
posterior
|
back
|
|
|
Cephalization
|
bilateral symmetry required.
sensory equipment concentrated at the anterior end including a central nervous system in the head. |
|
|
Tissues of germ layers(3 total)
|
diploblastic (2) (cnidarians)
triploblastic(3) Ectoderm Endoderm mesoderm |
|
|
What is another name for body cavity? What does it do?
|
Coelom
common with triploblastic organisms cushions suspended organs prevents internal injury |
|
|
coelomates
|
have true coelum. forms from mesoderm tissue with inner and outer layers of mesoderm that surround inner cavity.
|
|
|
Psedocoelomates
|
functional body cavity. formed from endoderm and mesoderm.
|
|
|
Acoelomates
|
lack body cavity
|
|
|
Protostome development
|
*Spiral and determined eight-cell stage
*tube of mesoderm forms coelom *mouth develops first from blastopore |
|
|
Deuterostome development
|
*radial and indeterminante eight-cell stage
* mesoderm folds in archenteron to form coelom *anus develops from blastopore |
|
|
Archenteron
|
initial sac of the future digestion tube.
|
|
|
True animals have tissues, which clade do they belong to and which basal animal is not included?
|
*Eumetazoa 'true animals'
*Porifera lack tissues |
|
|
clades withing Protostomia
|
Ecdysozoans
lophotrochozoans |
