Mendel

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Background information on Gregor Mendel

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Mendel

  1. 1. Instructions <ul><li>Come in and have a seat quickly and quietly </li></ul><ul><li>Hook: </li></ul><ul><li>What is the difference between a trait and an allele? Give examples of two traits and their possible alleles. </li></ul>
  2. 2. Gregor Mendel (p. 121) <ul><li>“ Father of Genetics” </li></ul><ul><li>Born in Austria in 1822, left home to join a monastery at 21. </li></ul><ul><li>Life Goal: To become a teacher… </li></ul><ul><li>… Mendel was a horrible test taker and failed his final exam…so he returned to the monastery </li></ul>Gregor Mendel by Kaptain Kobold
  3. 3. Mmmm…Peas… <ul><li>Monastery Gardner </li></ul><ul><li>Saw Differences in Peas </li></ul><ul><li>What were his questions?? </li></ul>Sea of Peas by pwilley
  4. 4. To Build a Better Pea… <ul><li>Goal: Find a way to grow better pea plants </li></ul><ul><li>Saw different characteristics </li></ul><ul><li>Which are best? </li></ul>Pea Flowers, Part II by tstadler
  5. 5. Flower Reproduction Pollen produced by Anther (male) transferred to Stigma (female) Leads to seed formation in Ovule
  6. 6. Self-pollination <ul><li>Pea plants are able to self-pollinate as well as cross-pollinate </li></ul>X YIELDS This is known as “true-breeding”
  7. 7. Mendel’s Experiment <ul><li>Mendel wondered what would happen if he crossed true-breeding purple and white plants </li></ul>X
  8. 8. <ul><li>WHAT HAPPENED!!!??? </li></ul>
  9. 9. Mendel’s Second Experiment <ul><li>Mendel took some of the new generation of peas and crossed them </li></ul>X
  10. 10. HUH????
  11. 11. How did this happen? <ul><li>With a partner nearby… </li></ul><ul><ul><li>Discuss what Mendel’s experiments showed </li></ul></ul><ul><ul><li>Try and determine the reason Mendel got the results he did </li></ul></ul>
  12. 12. Dominant vs. Recessive Alleles <ul><li>Mendel had discovered the basis of dominant and recessive alleles </li></ul><ul><li>Dominant alleles are ones that are expressed (shown) if they are present </li></ul><ul><li>Recessive alleles are hidden (recede) by dominant if only one copy is present </li></ul>
  13. 13. Second Generation (p. 120) Characteristic Dominant Recessive Ratio Flower Color 705 Purple 224 White 3.15:1 Seed Color 6002 YELLOW 2001 GREEN Seed Shape 5474 round 1850 wrinkled Pod Color 428 green 152 yellow Pod Shape 882 smooth 299 bumpy Plant Height 787 TALL 277 short

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