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Ch.13   meiosis
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  • Valentine’s Day Perfect time to introduce the next subject in class


  • 1. Meiosis & Reproduction
  • 2. Asexual Reproduction• Identical offspring (clones)• Mitosis• Different kinds – Binary fission – Budding – Fragmentation – Regeneration
  • 3. Sexual Reproduction• Two parents• Genetic variation• Haploid gametes• Unique offspring – Similar to parents – Similar to each other
  • 4. Genetic VariationFor humans - 23 pairs of chromosomes:• Independent Assortment – 50/50 chance that gamete gets maternal/ paternal homologous chromosome – # of possible gametes = 223 – >8 million possible gamete combinations• Random Fertilization – (8 million)(8 million) = 64 trillion possible offspring• Crossing over – increases genetic variation even more
  • 5. Haploid vs. DiploidHAPLOID DIPLOID• 1n • 2n• One copy of each • Two copies of each chromosome chromosome • Homologous chromosomes
  • 6. Karyotyping
  • 7. Human Female Karyotype
  • 8. Human Male Karyotype
  • 9. Life Cycles
  • 10. Overview of Meiosis• Diploid parent cell divides twice to make haploid gametes• Homologous chromosomes• Sister chromatids
  • 11. Meiosis I
  • 12. Meiosis II
  • 13. Mitosis vs. Meiosis
  • 14. Gamete Possibilities(due to Independent Assortment)
  • 15. Crossing Over• Increases genetic variation• Synapsis• Tetrad• Chiasma• Happens during Prophase I
  • 16. Homologous chromosomes movetoward opposite poles of a dividingcell duringA. MitosisB. Meiosis IC. Meiosis IID. FertilizationE. Binary fission
  • 17. If the DNA content of a diploid cell inthe G1 phase is x, then the DNAcontent of the cell at metaphase I ofmeiosis would beA. 0.25xB. 0.5xC. xD. 2xE. 4x
  • 18. For the same cell, the DNA contentat metaphase II of meiosis would beA. 0.25xB. 0.5xC. xD. 2xE. 4x
  • 19. How many different combinations ofchromosomes can be packaged ingametes by an organism with adiploid number of 8 (2n = 8)?A. 2B. 4C. 8D. 16E. 32