Meiosis And Variation (Potato Head)

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Meiosis And Variation (Potato Head)

  1. 2. 1- How does DNA work? 2- How is a persons DNA passed on to their children? 3- What is the difference between how cells divide and humans reproduce? Passing Notes
  2. 3. There are 46 pieces of DNA or CHROMOSOMES in human beings ( diploid number) X Y 23 pairs of chromosomes. One of each pair is from MOM, other from DAD!
  3. 8. Sexual Reproduction, Variation, and Meiosis
  4. 9. -Understand why sexual reproduction is advantageous to individuals of a specific species. -Given a diagram of male and female cells, each having two pairs of chromosomes, the student will:  diagram the four possible gametes from the male and female cells.  explain why it is necessary for the number of chromosomes in the gametes to be half that of the parent cell.  explain how meiosis promotes genetic diversity in the offspring at fertilization. The Objective
  5. 10. -meiosis - chromosome -chromatid -haploid -diploid -variation -random segregation / independent assortment -random fertillization -crossing over -natural selection Vocabulary
  6. 11. Why Sex? Why is it an advantage/adaptation for a species to reproduce sexually versus asexually?
  7. 12. A human egg surrounded by sperm - one of which will fertilize it http://www.bbc.co.uk/schools/gcsebitesize/biology/variationandinheritance/1reproductionandgenderrev5.shtml
  8. 14. ACTIVITY: Mr. Potato Head
  9. 16. Step 3.
  10. 19. Variation?
  11. 20. Why Sex?
  12. 21. Why is sexual reproduction better? Evolution : “The Advantage of Sex” “ Hitting a moving target…”
  13. 22. Why is sexual reproduction better? Evolution : “The Advantage of Sex” Use the analogy of the “ Red Queen ” to explain why sexual reproduction is advantageous.
  14. 23. Face Lab 01-13-2002                           
  15. 24. Face Lab A study of human genetics - In this activity you will perform a simulation to study how facial characteristics are inherited. - You will follow the basic Mendelian Laws of Inheritance to detemine your childs genotype and then draw their phenotype .
  16. 25. Face Lab Vocabulary gene allele genotype phenotype dominant recessive sex chromosomes
  17. 26. Face Lab Inheritance Patterns Dominant Recessive Incomplete Dominance Codominance Polygenic Sex-linked Traits
  18. 27. Face Lab General Genotype Rules 1- Genes come in pairs. (one from each parent) 2- Use letters to represent genes. 3- Dominant vs Recessive 4- Homozygous vs Heterozygous
  19. 28. Variations on a Human Face Face Lab Genotype Data Table Checklist for Phenotypes Phenotype Illustrations
  20. 29.   THE ASSIGNMENT : make a 30 second commercial which explains and “sells” the answer to the question or topic you were assigned. You will perform tomorrow. HINTS : commercial can be a jingle, you can act out a scene, use propts / signs. MANDATORY : You must use the bold words in the question and you must correctly explain the concept – “sell it!”   Sexual Reproduction and Variation Commercials
  21. 30. Group 1: Explain why sexual reproduction is better than asexual reproduction in terms of survival and natural selection . ( variation ) Group 2: Why is meiosis necessary for organisms that reproduce sexually ? (Explain how meiosis creates gametes or sex cells with half the normal number of chromosomes ) Group 3 : In meiosis , independent assortment of chromosomes , is a source of variation . Explain how this works and when it happens in meiosis Group 4: Crossing over of chromosomes is another source of variation . Explain what crossing over is and how it happens. (talk about the exchange of genes between homologous chromosomes ) Group 5: Random fertilization is also a source of variation in sexually reproducing organisms. Explain why this is a source of variation . Group 6: Meiosis is really complicated explain how it is similar and different from mitosis . (include info about chromosome number ( diploid / haploid )) Sexual Reproduction and Variation Commercials
  22. 31.   Group 1: Explain why sexual reproduction is better than asexual reproduction in terms of survival and natural selection . ( variation )     Sexual Reproduction and Variation Commercials
  23. 32.     Group 2: Why is meiosis necessary for organisms that reproduce sexually ? (Explain how meiosis creates gametes or sex cells with half the normal number of chromosomes )     Sexual Reproduction and Variation Commercials
  24. 33.   Group 3 : In meiosis , independent assortment of chromosomes , is a source of variation . Explain how this works and when it happens in meiosis   Sexual Reproduction and Variation Commercials
  25. 34.   Group 4: Crossing over of chromosomes is another source of variation . Explain what crossing over is and how it happens. (talk about the exchange of genes between homologous chromosomes )   Sexual Reproduction and Variation Commercials
  26. 35.   Group 5: Random fertilization is also a source of variation in sexually reproducing organisms. Explain why this is a source of variation .   Sexual Reproduction and Variation Commercials
  27. 36.   Group 6: Meiosis is really complicated explain how it is similar and different from mitosis . (include info about chromosome number ( diploid / haploid )) Sexual Reproduction and Variation Commercials
  28. 37. 3 persons per group / Numbered 1-3 / Each person answers a question and passes the note to the next person who answers the next one, until all are done. 1- How does DNA work? 2- How is a persons DNA passed on to their children? 3- What is the difference between how cells divide and humans reproduce? Passing Notes

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