Animal diversity Flashcards Preview

Biodiversity > Animal diversity > Flashcards

Flashcards in Animal diversity Deck (16)
Loading flashcards...
1

What are the key traits of animals?

Eukaryote
multicellular
heterotrophic
muscle and nervous system
lack cell walls
unique cell junctions

2

What are the three cell junctions?

Tight junctions
desmosomes
Gap junctions

3

What are desmosomes?

Anchoring proteins, fasten cells into sheets

4

What are gap junctions?

Communication junctions

5

What are tight junctions?

plasma membrane of neighbour vcelss bound

6

What are homeobox genes?

large family of similar genes that direct the formation of many body structures during early embryonic development. A homeobox is a DNA sequence found within genes that are involved in the regulation of patterns of anatomical development

7

Hox genes?

Hox genes code for proteins that attach to molecular switches on DNA, turning other genes on and off - coded for by homeobox

8

What is the blastula?

Hollow ball of cells in embryo development

9

What is gastrulation?

When one end of the ball folds inwards and expands to fill blastocoel, makes embryonic tissue layers

10

What is the blastocoel?

fluid-filled cavity that forms in the animal hemisphere

11

Where did animals originate?

choanoflagellate ar ether closest living ancestors

12

What are choanoflagellate?

Colonial heterotrophic flagellate forst to evolve. single collar of. macromolecule used for feeding

13

What are the characteristics of protostome development?

spiral and determinate
mesoderm splits onto solid maps to form coelom
mouth develops from blastopore

14

What are the characteristics of deuterostome?

radial and indeterminate
Coelom forms from fold of archenteron
blastopore forms the anus

15

What are the different tissue layers?

Ectoderm
Endoderm
Mesoderm

16

What is a coelom?

fluid or air filled body cavity