Biology 1200 exam 3

Study son!
Body cavity (internal fluid filled space called

acoelom)
1. Acoelomates have

no body cavity
2. Pseudocoelmate have a

body cavity partially lined with mesoderm
3. Coelomate

coelom lies withinthe mesoderm
Protostomes vs Deuterostomes
- proto- pore becomes mouth
- deuter- pore becomes anus
Choanoflagellates are the sister taxon to animals. What proof is there?
- 1. Morphology: collar cells of sponges
- 2. More morphology: collar cells in other animals
- 3. DNA sequence data; cell signaling & adhesion genes
Why aren't chloanoflagellates animals?

Choanflagellates are univercellular or colonial

animals are multicellular
Which clades elvoved multicellularity
Tissue:

Specialized group of cells with a common function; isolated from other tissues by membrane.
Is the epidermal layer of sponges a true tissue?

yes!
Two variations to the body plan
- 1. Polyp (sessile)
- 2. Medusa (motile)

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Biology 1200 exam 3

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Biology 1200 exam 3 notes

Updated

2012-04-02T15:48:42Z