Topic 10 Terms (Intro to Animals) Flashcards Preview

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Flashcards in Topic 10 Terms (Intro to Animals) Deck (10):
1

What defines Animalia?

multicellular heterotrophs with
tissues

no cell walls

monophyletic group

2

How do animals reproduce?

gametic meiosis

3

Order of embryo development

zygote > morula > blastula > gastrula

ZM BG

4

diploblastic

2 cell layers in embryo

ectoderm: outer layer and nervous system

endoderm: inner layer and gut

5

triploblastic

3 cell layers in embryo

mesoderm: middle layer where most organs form from

6

4 key transitions in body plan for metazoans

1.) Radial symmetry
2.) Body cavities
3.) Protostome to deuterostome
4.) Segmented body plan

7

coelomate

fluid-filled cavity (coelom) in mesoderm, surrounded in mesodermal tissue

8

pseudocoelmate

Pseudocoel between mesoderm and endoderm

Not completely covered in mesodermal tissue, so that's why it's a pseudocoelomate

9

How protostomes develop

Spiral and determinate 8-cell stage

Mesoderm splits forming coelom

Mouth develops from blastopore

10

How deuterostomes develop

Radial and indeterminate 8-cell stage

Mesodermal outpocketings of archenteron form coelom

Mouth develops from secondary opening