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← Concept Map 5 Returns

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Showing Revision 1 created 09/29/2013 by Cogi-Admin.

  1. Alright, let's see how all these concepts
  2. are connected. Biological Relatives share Traits and
  3. DNA. And Biological Relatives and Traits can
  4. be organized, information about those can be organized
  5. using Pedigrees. Now there are three main
  6. types of Inheritance Patterns we covered for
  7. our Pedigrees. There's the Autosomal Inheritance Pattern,
  8. which is characterized by Alleles on Autosomes. There's
  9. the Sex linked pattern, which are characterized by
  10. Alleles on the Sex Chromosomes. And, then there's the
  11. Maternal Inheritance Pattern, characterized by Alleles on the Mitochondrial
  12. Chromosome. And, you can learn more about all these
  13. Chromosomes, if you need refresher, back in LESSON 2.
  14. Let's come back over here to Traits and Alleles.
  15. We see that there are two words going towards
  16. Traits and Alleles. One is the composite of observable
  17. Traits, the other is the specific composition of Alleles. So we know that the
  18. Phenotype describes what Traits you have, and
  19. your Genotype describes your Allelic combination. The
  20. Genotype determines your Phenotype. Your Genetype can
  21. also be Homozygous, to have the same
  22. Alleles or Heterozygous, to have different Alleles.
  23. But either way there are two main types
  24. of Alleles that we covered. There are
  25. Recessive Alleles, which are masked by Dominant
  26. Alleles. We could also speak from the
  27. perspective of Dominant Allele and say that
  28. it masks the Recessive Allele. Now all of these Alleles on DNA. The
  29. DNA must be duplicated before Cell Division and there are two main types of Cell
  30. Division. There's Mitosis and there's Meiosis. Mitosis results in All non Gamete
  31. cells. Whereas Meiosis results in Gametes,
  32. the sex cells that have 23 Chromosomes
  33. instead of the 46 that result after Mitosis. Now Meiosis increases Genetic
  34. Variability, through Chromosome Recombination and Independent
  35. Assortment. But this Genetic Variability can be
  36. diminished by Incest, or Inbreeding.
  37. Together, the Genetic Variability through Chromosome
  38. Recombination essentially mixes and matches the Alleles that create our Traits.
  39. [UNKNOWN]
  40. more about Alleles in LESSONS 3 and 4 if
  41. you want to go back and get a refresher. And of
  42. course pretty soon, we're going to learn about how these Alleles
  43. arise in the first place from Mutations and LESSON 6.