Bio 201 S14 Class 5 2 5 14 v2

Slide 37 figure 126 independent assortment slide 38

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Unformatted text preview: St. Thomas Monastery in Brno, Czech Republic Pea plant Pisum sa2vum What was Mendel doing? •  Prevailing model of the 1me: blending inheritance –  What is blending inheritance? •  Careful observa1on of variants in crosses of peas violates this model –  There were probably many other observa1ons by others in various species that did this as well •  e.g. Darwin’s work in snapdragons SLIDE 26 Mendel’s discoveries with pea plants •  These are controlled crosses, not popula1ons •  Mendel worked with 7 different traits SLIDE 27 Mendel conducted crosses with plants differing in one of seven distinct traits SLIDE 28 Ar1ficial pollina1on of plants •  •  Cross pollina1on of cofon hfp://www.youtube.com/watch?v=BXjwz_0eeVM –  Mendel did this in the first genera1on with peas SLIDE 29 Ar1ficial pollina1on of plants •  •  Self pollina1on of peas hfp://www.youtube.com/watch?v=kz0RsylZWz4 –  Mendel did this in the 2nd genera1on (with the F1 plants) (he might not have needed to do anything) SLIDE 30 Mendel performed two genera1ons in his crosses •  Fir...
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