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lec02 - Lecture 2 Mendelian genetics I Blending A...

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Picture 27 Lecture 2 – Mendelian genetics I. Blending? A. predominant theory during 19 th  century 1. germ cells contained sample of essences from each somatic cell 2. problem: clearly not all traits blended eg: Blue eyes X dark eyes dark eyes (rather than dark blue eyes) 3. Simple experiment (Weissman, 1883) Cut off mouse tails; tail essence should be missing, so offspring should have  short/no tails. Result: B. Mendel’s experiments lead to particulate theory of inheritance II. Introduction to Mendel A. Who he was: 1. monk in what is now Czech Republic 2. experiments in ~1865 looking at heredity in peas 3. work was rediscovered in 1900 4. Why successful:  B. why peas? 1. several varieties available (seed shape, seed color, flower color, pod shape, pod color,  flower and pod position, plant size) 2. easy to cross or self-fertilize 3. easy to grow 4. relatively short generation time 1
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