2005_campbl14

2005_campbl14 - Chapter 14: Mendel and the Gene Idea...

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Chapter 14: Mendel and the Gene Idea
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Important Point:
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Doing Well in 113! Do you feel that you knew the material going in to the last exam? At what level do feel you knew the material? Familiar with it in a general way? Able to recognize specifics if you saw them? Able to regurgitate specifics if prompted (e.g., via flash cards)? Able to recite specifics without prompting? Do you feel that you understood the material that you were studying? Have you been reading your text book prior to attending lectures? Do you understand your text book? Have you been giving yourself the time to go through the text book leisurely, or are you rushing to get in your reading just prior to class? What does studying for an exam mean to you?
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Doing Well in 113! What do you do after lectures to make sure that you understand and are familiar with material? Do you copy over the notes? Do you make flash cards? Do you read through the material presented in lecture, along with your notes, to identify what material might be giving you trouble? When do you start preparing for an exam? How well do you take care of yourself during the 24-hour run up toward the exam? Do you get sufficient sleep? How do you prove to yourself that you know the material when you reach the end of your studying for an exam? Do you find that you still have questions about the material during the day of the exam? Do you find that you are anxious on the day of the exam? If yes, what could you do to minimize that anxiety?
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Gregor Mendel “The best way to gain an understanding of genetics is to work with it. The fundamental principles discussed (below) will become clear to you, and you will grasp them more surely, if you carefully think through . . . problems which illustrate the various patterns of inheritance…” (Keeton, 1980, Biological Science third edition, W.W. Norton & Company, p. 621)
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Alleles and Loci Gene location on chromosome An allele is a gene variant (often differ only by one or few nucleotides) A gene is a discrete heritable unit Different alleles may or may not code for different phenotypes
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Crossing Peas Controlled breeding, with specific characters scored for specific traits (e.g., character = flower color, trait = purple vs. white) “Crossing” is mating
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First Generation Offspring First filial generation
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Note difference between “character” and “trait”
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Note 3:1 ratios A trait is a variant of a character The interaction between non- identical alleles results in interesting non-correspondences between genotype and phenotype
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2005_campbl14 - Chapter 14: Mendel and the Gene Idea...

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