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3chapter11
3chapter11
3chapter11
3chapter11
3chapter11
3chapter11
3chapter11
3chapter11
3chapter11
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3chapter11

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

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