PPP_Ch. 3 - Mendelian Genetics CHAPTER 3 Dr. Sanghamitra...

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CHAPTER 3 Mendelian Genetics Dr. Sanghamitra Mohanty
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3.1 3.1 Mendel Used a Model Experimental Approach to Study Patterns of Inheritance Mendel chose the garden pea as his model system because it is easy to grow, can be crossbred artificially, and grows to maturity in one season. Using seven visible features, each with two contrasting traits, and true-breeding strains, Mendel determined that discrete units of inheritance exist and predicted their behaviour during the formation of gametes.
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Monohybrid Cross Monohybrid crosses involve a single pair of contrasting traits. The original parents are the P 1 generation, and their offspring are the F 1 generation. Offspring arising from selfing (self-fertilizing) the F 1 generation are the F 2 generation.
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In the F 1 generation of a monohybrid cross, all of the plants have just one of the two contrasting traits. In the F 2 generation, 3/4 of the plants exhibit the same trait as the F 1 generation, and 1/4 exhibit the contrasting trait that disappeared in the F 1 generation.
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To explain these results, Mendel proposed the existence of “ particulate unit factors ” for each trait. He suggested that these factors (now called genes ) are passed unchanged from generation to generation, determining various traits expressed by each individual plant.
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Mendel’s monohybrid crosses were not sex dependent.
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PPP_Ch. 3 - Mendelian Genetics CHAPTER 3 Dr. Sanghamitra...

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