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  • 1. AIM: How can organisms be improved using the idea of natural selection? Warm – up: In evolutionary terms, why is one organism more likely to survive than another?
  • 2. Artificial selection § Artificial breeding can use variations in populations to create vastly different “breeds” & “varieties”
  • 3. Artificial selection § Artificial breeding can use variations in populations to create vastly different “breeds” & “varieties” “descendants” of the wolf
  • 4. Artificial selection § Artificial breeding can use variations in populations to create vastly different “breeds” & “varieties” “descendants” of wild mustard “descendants” of the wolf
  • 5. Artificial selection § Artificial breeding can use variations in populations to create vastly different “breeds” & “varieties” “descendants” of wild mustard “descendants” of the wolf
  • 6. Selective Breeding
  • 7. Selective Breeding Selective Breeding: Process in which
  • 8. Selective Breeding Selective Breeding: Process in which particular individuals are chosen and allowed
  • 9. Selective Breeding Selective Breeding: Process in which particular individuals are chosen and allowed to breed, whereas others are prevented from
  • 10. Selective Breeding Selective Breeding: Process in which particular individuals are chosen and allowed to breed, whereas others are prevented from breeding.
  • 11. Selective Breeding Selective Breeding: Process in which particular individuals are chosen and allowed to breed, whereas others are prevented from breeding. • Alleles that give characteristics favored by humans are retained, while undesirable characteristics are eliminated.
  • 12. Selective Breeding Selective Breeding: Process in which particular individuals are chosen and allowed to breed, whereas others are prevented from breeding. • Alleles that give characteristics favored by humans are retained, while undesirable characteristics are eliminated. • Raw genetic material is hidden and often allows for hidden variations to show through
  • 13. Selective Breeding Selective Breeding: Process in which particular individuals are chosen and allowed to breed, whereas others are prevented from breeding. • Alleles that give characteristics favored by humans are retained, while undesirable characteristics are eliminated. • Raw genetic material is hidden and often allows for hidden variations to show through
  • 14. Selective Breeding Selective Breeding: Process in which particular individuals are chosen and allowed to breed, whereas others are prevented from breeding. • Alleles that give characteristics favored by humans are retained, while undesirable characteristics are eliminated. • Raw genetic material is hidden and often allows for hidden variations to show through
  • 15. Selective Breeding Selective Breeding: Process in which particular individuals are chosen and allowed to breed, whereas others are prevented from breeding. • Alleles that give characteristics favored by humans are retained, while undesirable characteristics are eliminated. • Raw genetic material is hidden and often allows for hidden variations to show through
  • 16. Selection § Artificial selection is similar to directional selection. § Similarities? § Differences?
  • 17. Inbreeding § Involves breeding between closely related individuals with some desirable trait as the outcome § Loss of genetic diversity § If loss occurs to the extent at which every individual has identical alleles, that is referred to as complete homozygosity § Why is this a problem?
  • 18. Yorkshire Terriers (Yorkies)
  • 19. Yorkshire Terriers (Yorkies)
  • 20. Yorkshire Terriers (Yorkies)
  • 21. Bassett Hound
  • 22. Bassett Hound
  • 23. Bassett Hound
  • 24. Example of Inbreeding in Plants § Wheat plants generally self pollinate Ø High yield Ø Short stems Ø Pest resistance Ø High protein content of grain
  • 25. Outbreeding § Involves crossing individuals from genetically distinct strains to form hybrids. § Hybrids have characteristics which are superior to the characteristics in either parent. (Hybrid vigour / Heterosis)
  • 26. Liger
  • 27. Mule
  • 28. Mule
  • 29. Mule
  • 30. Mule
  • 31. HOMEWORK § Complete Ques. 3 from Classwork H.O. § Read p. 450 – 453

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