BI256- Midterm Exam Guide - Comprehensive Notes for the exam ( 71 pages long!)

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11 Oct 2017
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Cambrian explosion: period of rapid evolution and diversification. Occurred 500 mya, had 100 phyla of animals emerging, now 34 living phyla today. Body plan: regular arrangement of body structures relative to axis of the body [grade of organization, body symmetry, number of embryonic germ layers, and number of body cavities] Body plan: asymmetry, spherical symmetry, radial symmetry, bilateral symmetry. No body axis and no plane of symmetry. Infinite number of planes of symmetry, best for floating or rolling. Sense and interact with environment from all directions. General form of a cylinder (tubular, vase or bowl shaped) Jelly fish, sea jelly have radial symmetry, comb jellies are biradial symmetry. Animals divided alone sagittal plane into 2 identical portions (left and right) Dorsal (top), ventral (bottom), anterior (left) posterior (right) on cat model. 5 grades of organization within animals and animal-like groups. Organs made up of more than one kind of tissue. Organ work together as a system to perform a function.

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