BIOL202 - Study Guide - Lecture 16 - Natural Selection - Part 1

BIOL202 - Study Guide - Lecture 16 - Natural Selection - Part 1

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STUDY GUIDE: LECTURE 16 NATURAL SELECTION I “What a book a Devil’s chaplain might write on the clumsy, wasteful, blundering low and horridly cruel works of nature! Charles Darwin (1856, in a letter to the botanist J. D. Hooker) My reflection, when I first made myself master of the central idea of the 'Origin' [Natural Selection] was, 'How extremely stupid not to have thought of that'! T. H. Huxley, Darwin’s close friend and fellow biologist, 1888 The world is a thing of utter inordinate complexity and richness and strangeness that is absolutely awesome. I mean the idea that such complexity can arise not only out of such simplicity, but probably absolutely out of nothing, is the most fabulous extraordinarily idea. And once you get some kind of inkling of how that might have happened – it’s just wonderful. And… the opportunity to spend 70 or 80 years of your life in such a universe is time well spent as far as I am concerned. Douglas Adams, author of A Hitchhiker’s Guide to the Galaxy Reading : Black/Red Campbell 7 th ed. pg 444-448, then 464-466. Green Campbell, 6 th ed, pp. 435-438, then 457-460 Required On-line Mini-movie (link also available on course website) : http://www.pbs.org/wgbh/evolution/educators/teachstuds/svideos.html Watch Video 4. Required Web Activity (can access via course website as well): http://www.pbs.org/wgbh/nova/link/evolution.html Terminology to be familiar with : morphology melanin (noun) and melanic (adjective) “morph” (as in “melanic morph” of a moth, “white morph” of a flower, etc.) adaptive vs. maladaptive trait
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Questions, etc : NOTE: Written answers to questions marked with a * will be due in lab (as homework) the week of 14-17 November 1. a) Memorize the following definition of natural selection and make sure that you UNDERSTAND what this definition is saying. (Don’t just recite it, make sure it makes sense to you). differential survival and/or fecundity (ultimately leading to differential fitness ) of individuals with different forms or traits as a result of interactions with the biotic and abiotic environment b) In the past, when students have been asked to define natural selection on exams, all too frequently they have written: differential survival and/or fecundity (ultimately leading to differential fitness ) of an individual with different traits as a result of interactions with the biotic and abiotic environment This definition reveals a lack of understanding of the concept and would get zero points. Why does this definition make no sense? (it is the underlined part of the answer that is the problem) 2. Understand the basic logic of how the normal form of an organism changes through the process of natural selection. For example, when temperatures in North America began to rise about 12,000 years ago, how did the Utah population of packrats adapt to this change, i.e., how did they evolve smaller, heat-dissipating bodies. See the overhead marked “There is nothing magical about natural selection” at the top for help with this one. 3. Who was Alfred Russell Wallace and why does his name come up in a discussion of
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This test prep was uploaded on 04/18/2008 for the course BIOL 202 taught by Professor Johnson during the Spring '05 term at Maryland.

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BIOL202 - Study Guide - Lecture 16 - Natural Selection - Part 1

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