01:119:115 Lecture Notes - Lecture 12: Blending Inheritance, Pollination, Veggie Burger
4 Mar 2020
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Topic 12: mendel and the gene idea: mendel"s experiment approach. Why pea plants? (what makes a good test organism) Easy to grow in short generation time. Easy to control pollination: testing blending hypothesis. Mendel crossed true-breeding plants with contrasting traits. True breeding = he bred them 100x to make sure they always produce all purple or all white. Crossing two different flowers in p generation results in first generation (f1) This 25% white-flowered plants defies bleeding hypothesis because according to it, all purple-flowered plants should have been produced. No lighter purple- flowered plant was produced as hypothesized by blending hypothesis. Blending of fluids cannot explain either observation. Heritable factors - genes determine character, they are discrete units. Each character controlled by 2 factors (genes) from parents. Mendel"s particulate inheritance model explains the 3:1 inheritance pattern in f 2 offspring. 4 related concepts make up this model. Alternative versions of genes (2n means 2 of each allele)
