Lec+17+2010 - Unit V Mendel and the Gene Lecture 17 Simple...

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Unit V: Mendel and the Gene Lecture 17: Simple Mendelian Genetics Lecture 18: Human genetic disease Lecture 19: Chromosomes and inheritance Fall 2010, Bio 93, O’Dowd and Warrior, UCI - Copyright: All rights reserved
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Lecture 17: Simple Mendelian Genetics Monday 11/01/10 Reading: Ch. 14, pp. 262-275 Online Quiz Genetics Problems Ch. 14: 1, 5, 6, 12 READ ‘TIPS FOR GENETICS PROBLEMS’ - pg 283 17-1 Fall 2010, Bio 93, O’Dowd and Warrior, UCI - Copyright: All rights reserved
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Modern genetics began with Gregor Mendel’s quantitative experiments with pea plants The origin of experimental genetics 17-2 Fall 2010, Bio 93, O’Dowd and Warrior, UCI - Copyright: All rights reserved
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Mendel crossed pea plants with different characteristics and traced the traits from generation to generation 17-3 Fall 2010, Bio 93, O’Dowd and Warrior, UCI - Copyright: All rights reserved Peas normally self fertilize
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Law of segregation Different versions of inherited characteristics are caused by alternative versions of a gene An organism inherits two alleles, for each characteristic, one from each parent If alleles differ, one is dominant and the other recessive The two alleles separate during gamete formation and are therefore present in different gametes Mendel’s First Law 17-4 Fall 2010, Bio 93, O’Dowd and Warrior, UCI - Copyright: All rights reserved
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3 / 4 of plants have purple flowers 1 / 4 of plants have white flowers Mendel’s Law of Segregation
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