4a - MACRO-EVOLUTION: ORIGIN OF UNIVERSE, AGE OF LIFE ON...

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1 MACRO-EVOLUTION: ORIGIN OF UNIVERSE, AGE OF LIFE ON EARTH, GEOLOGICAL TIME SCALE I. AGE AND ORIGIN OF LIFE ON EARTH II. FIRST SIGNS OF LIFE ON EARTH III. EVOLUTION OF MULTI-CELLULAR ORGANISMS IV. GEOLOGICAL DATING METHODS V. GEOLOGICAL TIME SCALE I. AGE AND ORIGIN OF LIFE ON EARTH A. Age of the Universe • originated between 10 to 15 billion years ago following an explosion or Big Bang. B. Age of the Earth •Based on several radiometric dating methods of rocks and meteorites found in North America, Greenland, Australia, Africa, and Asia physicists and geologists estimate that the earth is between 4.5 to 5 billions years old . A sequence of events that might have led to the fi life. The beginnings of the earliest life forms on earth are said to be related to those molecules that have the ability to pair up in double helices like DNA
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2 Prokaryote (single cell) Eukaryote (Multicellular) 3. Multicellular organims appeared between 2. Eukaryotes unicellular organism appeared about 1.5 bya. 1. Prokaryotes appearea about 3.5 bya. II. FIRST SIGNS OF LIFE ON EARTH A. Prokayrotic Organisms About 3.5 to 2.8 billions years ago organisms like a bacterium (called prokayrotic) that do not have a nucleus in the cell appeared. B. Prokayrotic or single cell organisms reproduced asexually by fission to form duplicates copies. C. Genetic diversity was derived primarily from mutations
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3 III. EVOLUTION OF MULTI-CELLULAR ORGANISMS A. Eukayrotic Organisms •About 1.5 billions years ago organisms made-up of cells with true nuclei that divide by mitosis (called eukayrotic) developed. B. About 510 to 590 million years ago the eukayrotic organism gave rise to multi-cellular all the vertebrate animals evolved. C. MCO reproduced sexually D. sexual reproduction. 1. Prokaryotes appeared about 3.5 bya. 2. Eukaryotes unicellular organism appeared about 1.5 bya. 3. Multicellular
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This note was uploaded on 11/18/2009 for the course ANTHRBIO 161 taught by Professor Mitani during the Spring '08 term at University of Michigan.

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4a - MACRO-EVOLUTION: ORIGIN OF UNIVERSE, AGE OF LIFE ON...

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