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Investigation 9 2 2008
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Investigation 9 2 2008

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Transcript

  • 1. Inheritance Genetic Information being passed from one generation to the next
  • 2.  
  • 3. Gregor Mendel
    • “ Father of Genetics”
  • 4. Study of Genetics
    • Mendel studied the trait of pea plant flowers and learned:
      • When both parent pea plants had purple flowers, the offspring were purple
      • When both parent pea plants had white flowers, the offspring were white
    • He wondered what would happen if one parent pea plant had white flowers and the other had purple
  • 5. What happened?
    • Mendel discovered that the offspring where either ALL purple or ALL white
      • They were not as he hypothesized – a light purple
    • He reasoned that the offspring (baby pea plants) must be inheriting something from each parent that told them what color to be
  • 6. The Cell
    • Story of inheritance is told by the cell
    • Inside the nucleus is DNA – the inheritance messenger
    • DNA is coiled into chromosomes which are the structures that carry the message of inheritance
  • 7.  
  • 8.
    • Nucleus contains chromosomes
      • Occur in identical pairs
    • Band on each chromosomes represents the allele
  • 9. Genes and Alleles
    • Two alleles on the paired chromosomes work together
      • These are a GENE
    • A gene controls a trait
  • 10.  
  • 11. Genotype
    • Alleles are the code that determine the trait
    • Combination of alleles in an organism’s chromosomes is the genotype
      • Lists the paired alleles for that organism
      • Examples: AA, ee, Tt
    • Genetic make-up of an organism
  • 12. Dominant and Recessive
    • Not all alleles have an equal influence in determining traits
    • Alleles with more influence are called DOMINANT ALLELES
      • Represented by UPPERCASE letters (TT)
    • Alleles with less influence are RECESSIVE
      • Represented by lowercase letters (tt)
  • 13.  
  • 14. Phenotype
    • The physical result of an organisms genotype
      • What an organism looks like because of its genotype
  • 15. Reflection page 60