lectmendel - Gregor Johann Mendel “Father of Genetics”...

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Unformatted text preview: Gregor Johann Mendel “Father of Genetics” Mendel’s success • Came up with an elegant model of experimental design – chose a good “model” organism: Pisum sativum – restricted his examination to one or very few pairs of contrasting traits in each experiment – took meticulous notes with accurate quantitative records Empirical approach • Mendel did not have a hypothesis that he was testing ( hypothetico-deductive method )… instead his experiments were designed to determine the quantitative relationships from which laws could be discovered Seven pairs of contrasting characteristics of the garden pea-seed coat, seed color, petal color, pod shape, pod color, stem size, axial/terminal flowers. Monohybrid cross • Hybridization = when two plants of the same species but with different characteristics are crossed (mated) to each other. • Mono = dealing with one pair of contrasting characteristics Mendels results Parental F1 F2 F2 ratio Round x wrinkled All round 5474 round 1850 wrinkled 2.96:1 Yellow x green seeds All yellow 6022 yellow 2001 green 3.01:1 Purple x white All purple 705 purple 224 white 3.15:1 Inflated x pinched All inflated 882 inflated 229 pinched 2.95:1 Green x yellow pods All green 428 green 152 yellow 2.82:1 Axial x terminal All axial 651 axial 207 terminal 3.14:1 Long x short All long 787 long 277 short 2.84:1 Mendel’s explanation 1) the existence of “factors” – particulate theory of inheritance 2) genes are in pairs 3) the principle of segregation 4) gametic content 5) random fertilization Mendel’s First Law...
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lectmendel - Gregor Johann Mendel “Father of Genetics”...

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