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3chapter11 3chapter11 Presentation Transcript

  • CHAPTER 11 Introduction to Genetics
  • Gregor Mendel
    • Austrian monk who worked with true-breeding pea plants
    • He cross-pollinated them
    Angela + Allie
  • Basics of What Mendel Learned
    • Genes  passed from parents to offspring
    • Dominant  allele that will show up
    • Recessive  allele that will not show up
    • Alleles separate independently
    Allie Presher
  • Phenotypes vs. Genotypes
    • Examples of phenotypes:
    • 1. Tall pea plants
    • 2. Brown hair in humans
    • Examples of genotypes:
    • 1. TT  homozygous
    • Tt  heterozygous
    • tt  homozygous
    2. BB Bb bb Allie Presher
  • Punnett Squares Punnett squares show the probability of possible outcomes of certain traits in organisms. Angela Nguyen
  • Incomplete Dominance and Codominance
    • Angela Nguyen
    Example of Incomplete Dominance: Example of Codominance:
  • Polygenic Traits
    • Controlled by two or more genes
      • Example:
        • Skin color in humans
    Angela Nguyen
  • Meiosis
    • Allie + Angela
  • Linked Genes
    • Genes that are on the same chromosome: they stay together
      • Example:
        • Black body and reduced bristles on fruit flies
    Allie Presher