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Lecture 13 Population genetics I

Lecture 13 Population genetics I - Interested in learning...

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Interested in learning about how your body works? BIOLOGY 336 (00C): Human Physiology 2nd Summer Session July 2nd– August 8th, 2012, MTWTF 1:00-2:20PM Instructor: Dr. Patrick Cafferty Topics include respiration, circulation, contractility, osmoregulation, endocrinology, and neurophysiology. Prerequisites are Bio141 and Bio142 or instructor’s permission. Write to Dr. Patrick Cafferty if you have any questions: [email protected]
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Biol142 Foundations in Modern Biology II Cellular Biology and Genetics Lecture 13 – Wednesday, February 15 th , 2012 Population Genetics I. Reading: Klug, Emory 2 nd Ed. Chapter 23 (pages 483-488)
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Learning objectives At the end of this lecture, you will be able to: 1) Describe four common misconceptions about evolution from natural selection. 2) Explain the terms “Mendelian population” and “gene pool.” 3) Calculate allele frequencies for a gene with only two alleles ( A and a ) at a given locus. 4) Compare the allele frequencies and genotype frequencies for a given locus in two populations of organisms .
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1. Misconception #1 : Individuals do not evolve; populations of organisms evolve . Natural selection acts on individuals, but evolutionary change occurs in the characteristics of a population. Individuals do not change when they are selected, they simply produce more surviving offspring than other individuals do.
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Misconception #2 : Evolution by natural selection is not goal directed . Natural selection simply favors individuals that happen to be better adapted to the environment at the time. Adaptations do not occur because organisms want or need them.
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Misconception #3 : Evolution is not progressive , meaning producing better or more complex organisms.
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