BIOL202 - Study Guide - Lecture 17 - Natural Selection - Part 2

BIOL202 - Study Guide - Lecture 17 - Natural Selection - Part 2

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STUDY GUIDE: LECTURE 17 NATURAL SELECTION II: FURTHER DETAILS The study of adaptation is not an optional preoccupation with fascinating fragments of natural history; it is the core of biological study. Daniel Dennett, Darwin’s Dangerous Idea (1996) Reading : Red/Black Campbell 7 th ed. , pgs 459-460, pg 462-464, pg 469-470 Note : Refresher information on genes and heredity is found in Chpts 13-17 Green Campbell, 6 th ed. pgs 452-457, pg 459-460 Note : Refresher information on genes and heredity is found in Chpts 13-17 Relevant terminology : genotype vs. phenotype gene vs. allele mutation gamete genetic recombination crossing over discrete vs. continuous variation in form environmentally induced mutation morph As always, for some these terms, you can learn their definitions (e.g., environmentally induced mutation, discrete trait). For other terms, there is no distinct definition, but I would like you to have a general idea of what it is (e.g., genetic recombination, crossing over). Questions, etc : 1. Evolution by the process of natural selection requires that there is variation in form and that this variation is heritable . a) Why is variation in form or phenotype a critical prerequisite for evolution to occur through natural selection? For example, what would happen if, with the coming of the Industrial Revolution, there was NO variation in body color in moths, i.e., all individuals always had gray bodies?
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b) Why is it essential for variation in form to be heritable for evolution to occur through natural selection? For example, what would happen if, with the coming of the Industrial Revolution, melanic moths existed but their coloration was not heritable? Note: If the above two questions seem really easy… it is because they are. Don’t look for complex answers! 2. The "variation in form" among individuals in a population is often said to be the "raw material" for adaptation to environmental change through the process of natural selection. What is the ultimate source of all phenotypic variation among individuals? What other phenomenon, however,
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BIOL202 - Study Guide - Lecture 17 - Natural Selection - Part 2

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