Unit 5 Section 1

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Unit 5 Section 1 Notes

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Unit 5 Section 1

  1. 1. genetics<br />
  2. 2. genetics<br />GENETICS<br /><ul><li>Genetics is the study of HEREDITY.
  3. 3. Traits are passed down from PARENTS to OFFSPRING.</li></li></ul><li>genetics<br />WHICH CAN BE INHERITED?<br />SOME DISEASES<br />BAD TEMPER<br />RED HAIR<br />INTELLIGENCE<br />GOOD LOOKS<br />BALDNESS<br />MULLETS<br />
  4. 4. genetics<br />WHICH CAN BE INHERITED?<br />SOME DISEASES<br />BAD TEMPER<br />RED HAIR<br />INTELLIGENCE<br />GOOD LOOKS<br />BALDNESS<br />MULLETS<br />
  5. 5. genetics<br />MENDEL’S PEAS<br /><ul><li>Mendel performed experiments on pea plants by cross-pollinatingthem.
  6. 6. His work became the foundation of modern genetics.</li></li></ul><li>genetics<br />MENDEL’S PEAS<br />=<br />+<br />
  7. 7. genetics<br />MENDEL’S PEAS<br />=<br />+<br />
  8. 8. genetics<br />MENDEL’S PEAS<br />?<br />=<br />+<br />
  9. 9. genetics<br />GENES AND TRAITS<br /><ul><li>TRAITS (things you can observe) are controlled by GENES
  10. 10. GENES come in different forms called ALLELES</li></li></ul><li>genetics<br />GENES AND TRAITS<br /><ul><li>Stem height in peas is controlled by one gene with two different alleles: an allele for tall and an allele for short. </li></li></ul><li>genetics<br />GENES AND TRAITS<br /><ul><li>Alleles are inherited in pairs – one from each parent.
  11. 11. Dominant/recessive</li></li></ul><li>genetics<br />PUNNETT SQUARES<br /><ul><li>Used to show likely outcome of a genetic cross
  12. 12. One organism’s alleles are listed along the top, the other’s alleles are listed along the side.</li></li></ul><li>genetics<br />PUNNETT SQUARES<br />TALL (TT)<br />SHORT (tt)<br />
  13. 13. genetics<br />PUNNETT SQUARES<br />TALL (TT)<br />SHORT (tt)<br />
  14. 14. genetics<br />PUNNETT SQUARES<br /><ul><li>First generation offspring were Tt.
  15. 15. This means they were all _______</li></li></ul><li>genetics<br />PUNNETT SQUARES<br /><ul><li>First generation offspring were Tt.
  16. 16. This means they were all tall, since the gene for tall (T) is dominant.</li></li></ul><li>genetics<br />PUNNETT SQUARES<br /><ul><li>Mendel then crossed the offspring from this generation.</li></ul>= ??<br />+<br />Tt<br />Tt<br />
  17. 17. genetics<br />PUNNETT SQUARES<br />=<br />+<br />TT<br />Tt<br />Tt<br />Tt<br />Tt<br />tt<br />
  18. 18. genetics<br />PUNNETT SQUARES<br />=<br />+<br />TT<br />Tt<br />Tt<br />Tt<br />Tt<br />tt<br />
  19. 19. genetics<br />YOUR ASSIGNMENT<br />

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