[BI256] - Final Exam Guide - Everything you need to know! (192 pages long)

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29 Mar 2017
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BI256
FINAL EXAM
STUDY GUIDE
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Animal Architecture Chapter 9 Lecture 1 BI256
Cnidarian polyps have radial symmetry and cell tissue grade of organization
Cambrian explosion (500 MYA)
period of rapid evolution and diversity
know due to fossil record based on body plan
There were few groups of animals during this time (about 100 phyla of animals emerging)
Started with little diversity, very warm sea, and abundant oxygen = explosion of diversity and
very fast evolution
Approx. 34 phyla of extant living multicellular animals with a distinctive body plan today
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Body Plan
ancestors of phyla limited structure of descendants
Regular arrangement of body structures relative to the axis of the body
animals can be bisected along at least one plan
How body plans differ?
in grades of organization
by body symmetry
Number of embryonic germ layers
Number of body cavities
Body Plans: Animal Symmetry
1. Asymmetry
No body axis and no plane symmetry
Examples: protozoa (amoeba) and Poriferans (sponge)
Amoeba Sponge
2. Spherical
Infinite number of planes
Best suited for floating and rolling
Rare, found only in protozoans (radiolarians)
Sense/interact with environment from all direction
Radiolarians
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