Gene Idea- chapter 14

Gene Idea- chapter 14 - Chapter14 Heredity:...

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Chapter 14 MENDEL AND THE GENE IDEA Heredity: The Story of Gregor Mendel The father of genetics: Johann (Gregor) Mendel o Mendel was a monk who was trained in science at the University of Vienna. o The realization that both parents contributed to the characteristics of the offspring  preceded the work of Mendel.   o The favored explanation of how this occurred was the blending theory of heredity. o Modern genetics began with Mendel, and lead to the replacement of the blending theory  with the  particulate theory of heredity .  The heredity that is passed on is received in  the offspring as packets.  The offspring can pass the same kind of packets to their own  offspring.   o Among Mendel’s teachers were: A physicist named Doppler who taught Mendel to use a quantitative experimental  approach in studying natural phenomena.  Using numbers and statistics, Mendel  had an amazing ability to study natural phenomena.  A botanist named Unger who interested Mendel in the inheritable variation in  plants. Mendel came from an agrarian society from his parents so he was  already familiar with plant species and variation.  Unger showed him how plants  could pass on traits from one generation to the next. o He came up with the idea of passing on traits from one generation to another in  heredity.  Up until Mendel made his discoveries, everyone though that heredity is  blending of traits from the parents.   o Mendel saw this wrong because he saw traits that would reappear after generations  were gone.  He not only saw this in humans but in animals too.   1
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These influences helped lead Mendel to the study of the variation of garden peas. But why peas?? – He chose them for three practical reasons.  One: You could grow peas in  relatively small plots and make a lot.  Two: There were many obvious traits about peas so  assistance could be used from other monks because traits were easy to determine. Three:  Revenue – You could eat the work when you were done or share them with the villagers. o Many different  characters  and  traits Characters –  Any detectible inheritable feature of an organism: Eye Color, Hair  Color Traits  – the number of different variants of a given character.  We show certain  traits for certain characters: Brown eyes, blue eyes, brown hair. Mendel had seven different characters to work with.  The traits were really easy to determine;  there was no gray area.
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