BIOL 2299 Lecture Notes - Lecture 3: Blending Inheritance, Transposable Element, Amylopectin
15 Sep 2016
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Mendel carried out his experiments from 1856 to 1863 in a small garden plot. Results published in scientific journal in 1866, and then rediscovered in 1900. First clear demonstrations of rules governing the transmission of hereditary elements from generation to generation. Before mendel, traits thought to blend in offspring--called blending inheritance. Fleming jenkins: blending inheritance, pre-mendel transmission theory. Each parent contributes to its progeny distinct of elements of heredity. Factors remain unchanged as they passed from generations. Mendel quantified how traits passed from parents to offsprings. True-breeding varieties=self-fertilized plants producing progeny only like themselves. Cut off male parts(anthers) off one parent. Brush with pollen of other parent plant. Now you have a first generation(f1) hybrids of the two parental plants. Reciprocal cross: cross between different true-breeding pea varieties in both directions. Observation: all f1 progeny exhibit only one parental trait. When mendel selfed the f1 peas, both parental traits appeared in f2 generations. Genes(hereditary determinants of traits) come in pairs.
