Lecture5_MitosisMeiosis

Lecture5_MitosisMeiosis - Dihybrid crosses, mitosis, and...

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Dihybrid crosses, mitosis, and meiosis Predict the results of a cross between PPTT and pptt parents, assuming that alleles of different genes do NOT stay together . Parental genotypes: PPTT pptt Gametes produced: F 1 offspring from cross Gametes produced by F 1 parents: F 2 offspring from selfing Actual results (from seed color and seed shape cross; Y = yellow, y = green, R = round; r = wrinkled) YYRR X yyrr • F 1 s all make • When F 1 s are self-fertilized, phenotypes of F 2 offspring are: yellow-round: green-round: yellow-wrinkled: green-wrinkled: TOTAL: What is the ratio of observed phenotypes? Which hypothesis do these data support? B. Other combinations of traits behave the same way C. Mendel’s conclusion: segregation of each pair of alleles occurs
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Take-home messages on the question of heritable variation (Darwin’s problem) • Genes do not • Genetic variation exists if there is Now we need to understand: • What is the physical basis of Mendel’s rules? Why do they work?
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This note was uploaded on 04/10/2008 for the course BIOL 180 taught by Professor Freeman during the Fall '07 term at University of Washington.

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Lecture5_MitosisMeiosis - Dihybrid crosses, mitosis, and...

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