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Fr. Gregor Mendel

Discover the success of Gregor Mendel, the Father of Genetics, through his innovative research on pea plants. Explore his pre-Mendelian ideas on inheritance, blending, and homunculus. Find out why Mendel’s choice of research organism, the pea plant, was crucial for his breakthroughs. Uncover Mendel's key experiments, conclusions, and the principles of dominance, segregation, and independent assortment. Learn about the extensions to Mendel's work, including incomplete dominance, co-dominance, and polygenetic inheritance. Dive into the fascinating world of genetics with Mendel's revolutionary discoveries.

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Fr. Gregor Mendel

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  1. Fr. Gregor Mendel Father of Genetics1822 - 1884

  2. Pre-Mendelian Ideas on Inheritance • Blending • Homunculus

  3. Homunculus

  4. Why was Mendel Successful? • Good Research Organism (pea plant) * Small, easy to grow in large numbers * short life cycle  could test several generations * Could cross or self-pollinate

  5. Could cross or self-pollinate(Why was this important????)

  6. Why was Mendel Successful? • Good Research Organism (pea plant) * Small, easy to grow in large numbers * short life cycle  could test several generations * Could cross or self-pollinate * Were “politically correct” (Explain!)

  7. Why was Mendel Successful? • Good Research Organism (pea plant) • Had good math/statistical background • Picked good pairs of traits to study:ex: Tall/shortex: (find for HW!)

  8. Mendel’s Experiments Experiment #1 • Created “pure breeding” tall plants • Created “pure breeding” short plants

  9. Experiment #1 (cont)Crossed “pure” tall x “pure” short

  10. Experiment #1 (cont)Crossed two F1 plants (Monohybrid Cross!)

  11. Now we know….

  12. Now we know….

  13. Same pattern • w “pure-breeding” purple & white:

  14. Same Pattern:

  15. Mendel’s Conclusions • Organisms inherit two “factors” for each trait, one from each parent • Principle/Law of Dominance • Principle/Law of Segregation • Law of Independent Assortment(Based on next cross…)

  16. Pure Purple Tall x Pure Short White P : F1 F2: (Homework):

  17. Test Cross:  Learn, then explain what it is & why Prof Dillon hates the following diagram:

  18. Text Rep of Test Cross:

  19. Extensions to Mendel • Incomplete dominance • Co-dominance • Pleiotrophy • Polygenetic inheritance

  20. Incomplete Dominance In snapdragons,R  red petals r  white petals

  21. Incomplete Dominance

  22. Incomplete Dominance

  23. Incomplete Dominance

  24. Incomplete Dominance If you mate a red with a white snapdragon… • RR X rr

  25. Incomplete Dominance If you mate a red with a white snapdragon… • RR X rr R r

  26. Incomplete Dominance If you mate a red with a white snapdragon… • RR X rr r R r R

  27. Co-dominance

  28. Co-dominance I A type A markers on surface of RBC I B  type B markers on surface of RBC i  neither A nor B markers on surface of rbc

  29. Co-dominance

  30. Co-dominance

  31. Co-dominance

  32. Co-dominance

  33. Co-dominance

  34. Co-dominance

  35. Co-dominance

  36. Polygenetic Each allele  melanin deposition The more genes, the more pigment (melanin).

  37. Remember:Environment influences Phenotype Same genotype!!

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