Unit Three Notes Heredity •The transmission of traits from one generation to the next. Greg Mendel –Austrian Monk---1800’s •Observed some traits disappeared in one generation, only to reappear in the next. Hypothesis •Some traits are stronger than others. Experimental Design •Needed something which could be easily manipulated. •Something with a variety of visible characteristics. The Garden Pea •Quick generation time •Does not require much space •Peas undergo self-fertilization oPollinate themselves •Could also pry open petal to make specific crosses between plants. •Many visible traits: Flower color Seed color Seed shape Plant height Parental Generation oFor each trait studied he wanted a true breedingplant to begin the experiment. oTrue Breeding→Generation after generation breeds true to a single visible trait. Experiment oCross two different parental generation plants (each One displays Oneversion of the trait) oParental white flower x purple flower cross them and plant the seeds to get the first generation
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