Investigation 9 2 2008

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Investigation 9 2 2008

  1. 1. Inheritance Genetic Information being passed from one generation to the next
  2. 3. Gregor Mendel <ul><li>“ Father of Genetics” </li></ul>
  3. 4. Study of Genetics <ul><li>Mendel studied the trait of pea plant flowers and learned: </li></ul><ul><ul><li>When both parent pea plants had purple flowers, the offspring were purple </li></ul></ul><ul><ul><li>When both parent pea plants had white flowers, the offspring were white </li></ul></ul><ul><li>He wondered what would happen if one parent pea plant had white flowers and the other had purple </li></ul>
  4. 5. What happened? <ul><li>Mendel discovered that the offspring where either ALL purple or ALL white </li></ul><ul><ul><li>They were not as he hypothesized – a light purple </li></ul></ul><ul><li>He reasoned that the offspring (baby pea plants) must be inheriting something from each parent that told them what color to be </li></ul>
  5. 6. The Cell <ul><li>Story of inheritance is told by the cell </li></ul><ul><li>Inside the nucleus is DNA – the inheritance messenger </li></ul><ul><li>DNA is coiled into chromosomes which are the structures that carry the message of inheritance </li></ul>
  6. 8. <ul><li>Nucleus contains chromosomes </li></ul><ul><ul><li>Occur in identical pairs </li></ul></ul><ul><li>Band on each chromosomes represents the allele </li></ul>
  7. 9. Genes and Alleles <ul><li>Two alleles on the paired chromosomes work together </li></ul><ul><ul><li>These are a GENE </li></ul></ul><ul><li>A gene controls a trait </li></ul>
  8. 12. Genotype <ul><li>Alleles are the code that determine the trait </li></ul><ul><li>Combination of alleles in an organism’s chromosomes is the genotype </li></ul><ul><ul><li>Lists the paired alleles for that organism </li></ul></ul><ul><ul><li>Examples: AA, ee, Tt </li></ul></ul><ul><li>Genetic make-up of an organism </li></ul>
  9. 13. Dominant and Recessive <ul><li>Not all alleles have an equal influence in determining traits </li></ul><ul><li>Alleles with more influence are called DOMINANT ALLELES </li></ul><ul><ul><li>Represented by UPPERCASE letters (TT) </li></ul></ul><ul><li>Alleles with less influence are RECESSIVE </li></ul><ul><ul><li>Represented by lowercase letters (tt) </li></ul></ul>
  10. 15. Phenotype <ul><li>The physical result of an organisms genotype </li></ul><ul><ul><li>What an organism looks like because of its genotype </li></ul></ul>
  11. 16. Reflection page 78

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