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BIO Chapter 3

Protoplasmic single celled organism (archeans, bacteria, protists)
Asymmetry No way to cut body exactly in half
Spherical any plane passing through the exact center of the body will cut it in half
Radial Bowl or vased shape organisms (cnidarians, sponges)
Protostome mouth forms first
Coelom place in the animal where the organs are found
Protostome division spiral cleavage, new cells are smaller added towards inside of embryo
Deuterostome radial cleavage, new cells are formed evenly sized added externally
Mosaic Early specialization of cells, embryo is broken apart incomplete defective embryos form
Relative Late specialization of cells, embryo is broken apart each continues normal development
Protostome Types Lophotrochozoans, ecdysozoans
Sponges are Metazoans, lack symmetry, most lack true tissues
Asconoid simplest, smallest, least efficient
Syconoid intermediate in size and efficiency, fold in body makes space for chanocytes
Leuconoid biggest, most efficient. no central cavity, chambers of chanocytes through body, multiple opportunities to obtain food
Created by: 1315037265174238



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