Human Genetics

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Human Genetics

  1. 1. Human Genetics<br />110<br />
  2. 2. Students will be able to<br />Understand the patterns of Human Inheritance<br />Demonstrate how sex chromosomes function<br />Describe sex-linked diseases<br />Evaluate the effects of environment on behavior<br />
  3. 3. Single Gene with Two Alleles<br />111<br />
  4. 4. Multiple Alleles<br />One gene has many different versions<br />
  5. 5. Blood Typing<br />One gene for standard blood type: I gene<br /> Three alleles A, B, O<br /> A modified blood surface<br /> B modified blood surface<br /> O No modification on surface<br />So IA or IB or i<br />112<br />
  6. 6. Blood Types due to 3 Alleles <br />Genotypes<br />IAIA<br />IAi<br />IBIB<br />IBi<br />ii<br />IAIB<br />Phenotypes<br />A Blood<br />A Blood<br />B Blood<br />B Blood<br />O Blood<br />AB Blood<br />112<br />
  7. 7. Blood Type - Second Gene (Rh)<br />Genotypes<br />Rh<br />No Rh<br />Phenotypes<br />+<br />-<br />So you can have A + or –<br /> B + or –<br /> AB + or –<br /> O + or -<br />
  8. 8. Traits with many genes<br />Height (4 different genes)<br />Skin color<br />Weight (130 genes)<br />112<br />
  9. 9. Sex Chromosomes<br />Two different types X and Y<br />X chromosome is complex<br />Y chromosome causes male traits <br />X<br />Y<br />X<br />X<br />Y<br />X<br />X<br />X<br />X<br />X<br />X<br />Y<br />113<br />
  10. 10. Sex-Linked Genes<br />Genes that are present on the X chromosome<br />Example: Colorblindness<br />114<br />
  11. 11. Colorblindness <br />XC = Normal color vision<br />Xc = Color Blindness (recessive)<br />XC<br />Y<br />XC<br />Y<br />XC<br />XC<br />XC<br />Xc<br />XC<br />Xc<br />Xc<br />Y<br />One copy you appear normal but have the disease gene “Carrier”<br />114<br />
  12. 12. Environmental Effects<br />Height<br />4 genes<br />Environmental Factors<br />Diet<br />Vitamins & Minerals<br />Exercise<br />Play Violin<br />Muscle coordination<br />Good Hearing<br />Instruction & Practice<br />115<br />
  13. 13. Hemophilia A<br />Xh = Hemophilia A<br />Xh<br />X<br />X<br />X<br />X<br />X<br />Xh<br />Y<br />Xh<br />Y<br />Y<br />X<br />What percentage will have hemophilia A?<br />b. What gender are they?<br />
  14. 14. Hemophilia A<br />Xh = Hemophilia A<br />Xh<br />X<br />Xh<br />X<br />Xh<br />Xh<br />Xh<br />Y<br />Xh<br />Y<br />Y<br />X<br />What percentage will have hemophilia A?<br />b. What gender are they?<br />
  15. 15. Hemophilia A<br />Xh Y<br />Father has hemophilia<br />None of sons get it<br />X<br />X<br />Xh<br />X<br />Xh<br />Xh<br />X<br />Y<br />X<br />Y<br />Y<br />X<br />What are the genotypes of the parents?<br />

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