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Diagram a cell with four chromosomes going through meiosis.

Diagram a cell with four chromosomes going through meiosis. Mitosis vs. Meiosis . Mitosis One division 2 diploid daughter cells Identical to parent cell. Mitosis Two divisions 4 haploid daughter cells Genetically different from parent cell.

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Diagram a cell with four chromosomes going through meiosis.

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  1. Diagram a cell with four chromosomes going through meiosis.

  2. Mitosis vs. Meiosis Mitosis • One division • 2 diploid daughter cells • Identical to parent cell Mitosis • Two divisions • 4 haploid daughter cells • Genetically different from parent cell http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter28/animation__how_meiosis_works.html

  3. Nucleus chromosomes

  4. Get one small, one medium and one large of each color chromosome. • What do the colors represent? • The Beads?

  5. Pair up chromatids with same size and color

  6. Pair up chromatids with same size and color • What does this represent? • What stage? • Haploid or diploid?

  7. Match homologous chromosomes

  8. Match homologous chromosomes • What are homologous chromosomes. Carry the same traits Each homologous pair has one from each parent

  9. Demonstrate crossing over during prophase.

  10. Demonstrate crossing over during prophase.

  11. Demonstrate metaphase

  12. Demonstrate metaphase

  13. Demonstrate the first division • Anaphase I and Telophase I

  14. Demonstrate the first division • Anaphase I and Telophase I

  15. Move your cells through the second division.

  16. Move your cells through the second division.

  17. How many daughter cells do you have? • Are the daughter cells haploid or diploid? • Are the cells genetically Identical or different from the parent cell?

  18. 4 Haploid Daughter Cells

  19. Parent Cell Daughter Cells

  20. Possible Combinations of chromosomes • http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter28/animation__random_orientation_of_chromosomes_during_meiosis.html 2n What does n represent? What was our haploid number of chromosomes? What is the possible number of combinations? 8 In people possible 8388608 combinations.

  21. Sexual Reproduction • Combines the genetic material of two organisms. • Introduces new gene combinations in a population. • Leads to genetic Variability in the population. • Gametes produced in meiosis fuse to form a zygote. • Gamete-reproductivecell that contains the haploid set of chromosomes…..sperm and egg • Zygote- Cell formed from fusion of gametes that contains the diploid set of chromosomes.

  22. Sexual Reproduction Methods • External Fertilization: the eggs are fertilized outside of the body • Internal Fertilization: the eggs are fertilized within the female reproductive tract • Conjugation: cells exchange genetic material • Prokaryotes

  23. Asexual Reproduction • Offspring arise from a single parent. • Offspring genetically identical to parent. • More likely to inherit mutations. • Leads to less diversity. • Mitosis

  24. Asexual ReproductionMethods • Budding • offspring grows out of the body of the parent. • Spores • a reproductive cell capable of developing into a new individual without fusion with another reproductive cell. • Fission • separation of the body into two new bodies

  25. Quiz • Compare and contrast sexual and asexual reproduction.

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