BIOL 1F90 Study Guide - Midterm Guide: Anagenesis, Tiktaalik, Genotype Frequency
9 Feb 2016
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Document Summary
Micro- small; too small to be seen with the naked eye. Environmental changes can allow for new types of organisms and are responsible for many extinctions. These environmental changes include climate/temp change, atmosphere, landmasses, flood, glaciation, volcanic eruptions, and meteorite impacts. 5 mass extinctions have taken place (oh divine pope take care), We know how sediments piling up make fossils and becoming rock- the organisms get buried quickly and hard parts are replaced with minerals- the deeper and older the organisms the deeper the rock bed. Using elemental isotopes in accompanying rock dates fossils, half-life is measured, and the igneous rock is usually dated. Biases in the fossil record include: anatomy, size, number, environment, geological processes, time, and paleontological interests. Atrophic cyanobacteria were preserved but heterotrophic ancestors were not. Cyanobacteria produced oxygen as a waste product of photosynthesis. Multicellular eukayotes arose 1. 5 bya (colony, division) Shell evolution and atmospheric oxygen, diversity in animals.
