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A. Gregor Mendel

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  1. A. Gregor Mendel Father of Genetics Stephanie Nelson, 2004

  2. 1. Studied pea plants. Stephanie Nelson, 2004

  3. 2. He wanted to find a pattern. How were certain characteristics passed from parent to offspring? Stephanie Nelson, 2004

  4. x B. Experiment #1 1. Crossed 2 short plants. Stephanie Nelson, 2004

  5. x 2. Short plants produce short plants. Duh! Stephanie Nelson, 2004

  6. x C. Experiment #2 1. Crossed 2 tall plants. Stephanie Nelson, 2004

  7. x 2. Tall plants produce tall plants. . . . and some short plants! Stephanie Nelson, 2004

  8. 3. He made 2 conclusions Some plants were “true-breeders”. Some plants were NOT “true-breeders”. Stephanie Nelson, 2004

  9. D. Experiment #3 1. Crossed a tall plant and a short plant. x Stephanie Nelson, 2004

  10. 2. Tall plants and short plants P generation 3. Tall plants F1 generation 4. 75% tall plants, 25% short plants F2 generation 3. Tall plants and tall plants Stephanie Nelson, 2004

  11. Who cares? Stephanie Nelson, 2004

  12. E. Conclusions 1. Each plant contained 2 genes for each trait. 2. Some genes were stronger or dominant 3. Some traits were weaker or recessive Stephanie Nelson, 2004