02-Mendel

02-Mendel - Mendelian Genetics Mendels monohybrid cross...

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Mendelian Genetics Mendel’s monohybrid cross experiments Mendel’s first three postulates the dihybrid cross and independent assortment the test cross the trihybrid cross behavior of genes in chromosomes pedigree analysis Gregor Mendel (1822-1884)
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Pisium sativum, grown at a garden in the monastery. easy to grow grows and reproduces in a single season self-fertilizing in nature (therefore, traits remains pure in nature ) can be easily cross-fertilized experimentally Mendel chose seven distinguishable characters from true-breeding strains (plant strains in which all traits appeared unchanged generation after generation) Mendel’s experimental system: the garden pea
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A monohybrid cross is the experimental mating of two individuals with contrasting forms of a character . only one character is studied in the experiment contrasting forms: traits The monohybrid cross P 1 : parental generation F 1 : first filial generation (offspring from P 1 ) F 2 : second filial generation (offspring from F 1 )
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1. seed shape 2. seed color 3. pod shape 4. pod color 5. flower color 6. flower position 7. stem length Garden pea characters studied by Mendel Note : because the plant that he chose is self-fertilizing in nature, he could assume that all plants were pure for their traits (true-breeding ).
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Mendel’s observations F 1 : all with one of the forms of the character F 2 ratios: ~3:1 P 1 Shape Color Shape Color
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How Mendel explained his results Each trait is determined by a unit factor Example : plant height (character) D : tall d : dwarf Unit factors are either
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02-Mendel - Mendelian Genetics Mendels monohybrid cross...

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