Animals and their Kingdom Flashcards
What developmental features do animal cells share?
Mostly reproduce sexually
Cells cleave in regular but different patterns
Form a blastula
What are the two main kinds of cleavage?
Spril and Radial
Gastrulation forms the gut and what three cell layesr?
Ectoderm - becomes skin n nervous system
Mesoderm- becomes muscles
Endoderm- becomes gut
How does a the blastula become the gastrula?
Invagination
What are the two types of symmetry?
Radial
Mostly bilateral, with a leading head.
What are the molecular and cellular features that are evidence for a common ancestor (four)?
Sodium-Potassium exchange pump
Various junctions between cells
Common extra-cellular matrix
Hox, genes specify body pattern and axis
What is the order of taxonomic organisation?
Species Genus Family Order Class Phylum Kingdom
What are the two types of cell layer organisation?
Diploblastic (cnidaria, ctenophora)
Triploblastic (most animals)
What are the three types of body cavities that influence how an animal can move?
Acoelomate - no cavity
Pseudocoelomate - cavity filled with large cells
Coelomate - fluid-filled cavity lined with epithelia
How long ago was the cambrian period?
540-490 mya
In the cambrian period most the living phyla appeared
TRUE
Who found the fossil-bearing strata in Burgess shale?
Charles Walcott
Where did all the animals live before the cambrian explosion?
The sea
Brain structure were established before or early during the cambrian period
TRUE
What happened after the cambrian?
Chordates evolved jaws, bony skull, vertebrate column,… vertebrates originated
Animals and plants colonised land
