lecture01 - to new forms and the good fit” between...

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BioEE 278 Fall 2007 Evolutionary Biology Lecture 1 INTRODUCTION - WHAT IS EVOLUTION? A. What is Evolution? < evolvere : unroll > 1. Change over time in the “form” of organisms: Macroevolution (change over long periods of time); microevolution (within populations); speciation (origin of new forms) [“form”: behavior, morphology, cellular processes, gene sequences, etc.] B. Fundamental Observations: Diversity, Hierarchical organization, and Adaptation 1. Diversity of form and changes in diversity over time 2. Hierarchical organization of diversity 3. "Good fit" between organism and environment – Adaptation of organism to environment. C. What is Evolutionary Biology? 1. Evolutionary biologists attempt to explain the processes (the “how and why”) that lead
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Unformatted text preview: to new forms and the good fit” between organisms and environment. 2. Lamarck proposed one (incorrect) hypothesis (incorrect) about the process leading to increasing adaptation, but believed that each species was created de novo . 3. Darwin’s Evolutionary Theory Evolution occurs through “Descent with Modification”; i.e. new forms evolve as modifications of pre-existing ones explains hierarchical organization of diversity The process of natural selection results in the better fit of organisms to their environment and the origin of new species (Wallace also conceived of the process of natural selection)...
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This note was uploaded on 09/28/2008 for the course BIOEE 2780 taught by Professor Geber during the Fall '07 term at Cornell.

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