BIO 1130 Lecture Notes - Lecture 1: Chondrichthyes, Pinacoderm, Primary Production

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Jon Houseman

Document Summary

Periods characterized by invertebrate organisms (jellyfish/sponges), in which large continental masses were located along the equator and were able to perfect aquatic environments allowing for experimentation of life. Burgess shales were because mountain release particles and created sediments of organisms that lived in the oceans between layers of shale. (organisms left impressions between the shale layers). Cambrian explosion; a collection of an enormous diversity of organisms was found and dated back to the same time and was found between these layers of shale. Sponge architecture: use of choanocytes in aquiferous environment (cells but no tissue) Choanocyte ancestor was a flagellated cell with a collar. Used adhesions to form colonies in order to more effectively create water currents using their flagellum in order to trap things on their microvilli that lined their. Cells do not communicate but they work together: totipotent cells. Stems cells that are able to differentiate and become any other cell: asymmetrical body plan.