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Bio 101 Day 21 - G regor Mendel AND The Basic Principle of...

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Gregor Mendel AND The Basic Principle of Heredity Chapter 11 “Solving Genetics Problems”—page 245 Genetics Supplement by Cronkite Gregor Mendel Published in 1866 University of Vienna --Quantitative and experimental methods in biological research (not just description) Garden Pea --Variation --Controlled Pollinations Mendel’s Methods --Established True Breeding Lines (pure lines) --Made crosses between plants that different in two contrasting characteristics Mendel’s Pea Crosses P Generation
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Tall Plant x Short Plant TT x tt F stands for filial—from Latin word for offspring F1 Generation All Tall Plants Tt F2 Generation 787 Tall 277 Short 1064 Total F2 Generation 3 Tall: 1 Short Tall Plant Tall Plant Tall Plant Short Plant Tt Tt Tt tt Mendel’s Observations --In every case, one trait masked the expression of another
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--Genetic factors do not “blend together” in hybrids --Now known as Mendel’s Principle of Dominance --Dominant Genes --Recessive Genes --Recessive Traits reappear in the F2 Generation
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