Mendel And Mendelian Genetics

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Mendel And Mendelian Genetics

  1. 1. Mendel and Mendelian Genetics <ul><li>Gregor Mendel 1822-1884 </li></ul><ul><li>Published his findings in 1865 </li></ul>
  2. 2. Quick Review
  3. 3. Review (continued)
  4. 4. Still Review
  5. 5. Mendel <ul><li>Considered the father of modern genetics </li></ul><ul><li>Studied inheritance of pea plants </li></ul><ul><li>Said that inheritance followed certain laws. </li></ul><ul><li>His laws were not well accepted at first. </li></ul>
  6. 6. Why Pea Plants? <ul><li>Mendel used pea plants in his experiments largely because of their ability to self pollinate. </li></ul>
  7. 7. Mendel’s laws of inheritance <ul><li>Mendel came up with two major laws of inheritance: </li></ul><ul><ul><li>The law of segregation (4 parts) </li></ul></ul><ul><ul><li>The law of independent assortment. </li></ul></ul>
  8. 8. Law of Segregation <ul><li>There are four parts to this law </li></ul><ul><ul><li>There are alternate versions of genes called alleles. </li></ul></ul><ul><ul><li>For each characteristic, an organism inherits two alleles. </li></ul></ul><ul><ul><li>Alleles interact in a number of ways. (dominance, incomplete dominance, codominance) </li></ul></ul><ul><ul><li>The two alleles for a trait separate during gamete production </li></ul></ul>
  9. 10. Law of independent assortment <ul><li>This law states the inheritance of one trait will not affect the inheritance of another. </li></ul><ul><li>This is only true for traits that are not linked. </li></ul>
  10. 11. The importance of Mendel <ul><li>Why is Mendel’s work so important? </li></ul><ul><ul><li>Before his time no one took the time to figure out how traits were passed on. </li></ul></ul><ul><ul><li>Mendel’s work laid the basic framework for other scientists to build on. </li></ul></ul>
  11. 12. After Mendel <ul><li>Mendel’s work was rediscovered in 1900. </li></ul><ul><li>Other scientists started to add to his ideas to build the current model of genetics as we know it. </li></ul><ul><li>This is called classical genetics. </li></ul>
  12. 13. Crosses <ul><li>Heterozygote: contains both types of alleles for a trait. (Aa) </li></ul><ul><li>Homozygous: contains only one allele for a trait (AA or aa) </li></ul><ul><li>Generations are labeled as F # </li></ul>
  13. 14. Monohybrid vs Dihybrid <ul><li>Monohybrid = Aa X Aa </li></ul><ul><li>Dihybrid = AaBb X AaBb </li></ul><ul><li>Law of independent assortment says that the inheritance of A will not effect B. </li></ul>
  14. 16. http://www.biology.arizona.edu/mendelian_genetics/mendelian_genetics.html

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