lesson5 - 5 There is Grandeur in this View of Life Study...

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5 There is Grandeur in this View of Life Study Tip: About this time in the course I usually get someone who asks something like “Do we really have to know all the names.” The motivation comes from the observation that many students have made in many classes that you won’t actually be held responsible for knowing much of what you were assigned to read. But this class is different. This isn’t a standard textbook that someone else wrote. This puppy is mine, and I’ve already sifted out all the unnecessary material. Don’t play guessing games. If you’re betting that I won’t cover something on the exam, then you’re playing the academic equivalent of Russian roulette, but in this case most of the chambers are loaded! If a concept is fuzzy for you, please let me know and we’ll get it clarified. Thanks. Key Terms and Concepts o Selection o Directional selection o Natural selection o Stabilizing selection o Fitness o Disruptive selection o Evolution o Individual selection o Melanism o Personal fitness o Self- organizing systems o Kin selection o Population o Inclusive fitness o Phenotypic evolution o Scientific creationism o Adaptation o Inter- specific correlation o Intra- specific correlation o Convergent evolution o Experimental method Lesson 5 61
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In this lesson we will take our first detailed look at the last two components of the genetic-evolutionary model, namely adaptation and evolution . These are less familiar to most people than are the first two components (development and mechanisms). It is not the case that adaptation and evolution are less important, but that they operate over time scales that are less familiar and they employ a process—natural selection—that is not as readily observed. However, once one has learned how this important process operates, its presence cannot be denied and indeed is everywhere you look. There is indeed “grandeur in this view of life,” the words Darwin chose to conclude his 1859 book “On the origin of species.” Selection is erywhere, it is powerful, and it needs to be understood. ev Selectionist Thinking Let’s turn our attention now to natural selection , a process that earned Charles Darwin worldwide acclaim in the latter half of the 19th century and which still commands the eager attention of thousands of scientists today. Natural selection is both elegant in its simplicity (“how extremely stupid not to have thought of that!” remarked T. H. Huxley upon first reading Darwin’s Origin of Species ), and subtle and far-reaching in its ramifications. Three conditions must exist for natural selection to produce evolution. We will review each condition before tying them together as a single package. 1.
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This note was uploaded on 05/27/2010 for the course BIOS 373 B02 taught by Professor Dr.danielleger during the Spring '10 term at UNL.

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lesson5 - 5 There is Grandeur in this View of Life Study...

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