LS1_LECTURE2

LS1_LECTURE2 - Dr. Allison Alvarado, [email protected]..

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Dr. Allison Alvarado, [email protected] Office hours: Fridays 9:30-11:30 am SH 2847
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± Bookstore ± Mastering Biology ± Homework ± Enrollment ± CCLE site/Email ± Demo ± Midterms
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Genes Landscape Community Individual Community Population Individual Individual Community Community Population Population Population Smaller Scale Larger Scale Hierarchy in Nature
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Why do we care about evolution? ± Explains the relatedness of all of life ± Explains differences between organisms ± Explains how organisms adapt to changing environments ± Works on many levels from molecules to populations to species
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Evolution and Natural Selection ± Evolution is a change in the characteristics of a population over time. ± Natural selection explains how evolution occurs. ± The theory of evolution by natural selection describes how species change through time. ± Charles Darwin, 1858 ± Pattern: All species are related by common ancestry ± Process: Descent with modification ± Characteristics of species can be modified from generation to generation
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Natural Selection and Populations ± A group of individuals of the same species living in the same area at the same time constitute a population . ± Two conditions must be met for natural selection to occur in a population: 1. Individuals in the population vary in characteristics that are heritable (meaning parents pass trait on to offspring). 2. In a particular environment, certain versions of these heritable traits help individuals survive better or reproduce more than do other versions.
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± Natural selection acts on individuals, but evolutionary change occurs in populations. ± Adaptation is a trait that increases the fitness of an individual in a particular environment. ± If certain heritable traits lead
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This note was uploaded on 01/22/2012 for the course LS 1 taught by Professor Thomas during the Spring '05 term at UCLA.

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LS1_LECTURE2 - Dr. Allison Alvarado, [email protected]..

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