Chapter%2014%20Outline - CHAPTER14OUTLINE GregorMendel...

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CHAPTER 14 OUTLINE Gregor Mendel Mendel discovered the basic principles of heredity Mendel’s Experimental, Quantitative Approach Crossing pea plants o many varieties o control of plants mating Fig 14.2 Characters varied in an “either-or” manner Started with varieties that were “true-breeding” Mated two contrasting, true-breeding varieties o hybridization The true-breeding parents o Are called the P generation The hybrid offspring of the P generation o Are called the F 1  generation When F 1  individuals self-pollinate o The F 2  generation is produced Fig 14.5 F 2  generation A ratio of about three to one, purple to white flowers Purple flower color was dominant, and white flower color was recessive Table 14.1 Mendel’s Model Four related concepts make up this mode First, alternative versions of genes Second, inheritance of two alleles  Third, one allele is dominant and the other recessive  Alternative versions of genes alleles Fig 14.4
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Four related concepts make up this mode First, alternative versions of genes Second, inheritance of two alleles 
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Chapter%2014%20Outline - CHAPTER14OUTLINE GregorMendel...

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