Evolution.docx

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Department
Earth & Environmental Sciences
Course
EESC 1175
Professor
Alan Kafka
Semester
Spring

Description
Evolution  descent with modification • Descent = the transmission of characteristics by inheritance o Characteristics change from one generation to the next • Modification = changing Phylogeny  “family tree” of modification/changing species Example 1 – beetles on a diet vs. normal beetles • Environmental influences Example 2 – brown beetles vs. green beetles • Evolution Gene • Informal definition: a unit of heredity that is transferred from a parent to an offspring and is held to determined some characteristic of the offspring • Formal definition: the unit of heredity; a region of DNAwith a particular phenotypic effect o Phenotype = the observable physical or biochemical characteristics of an organism, as determined by both genetic makeup and environmental influences • Evolution  a change in gene frequency overtime Mechanisms of Change 1. Mutation a. Arandom/odd occurrence of gen
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