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Cell Division SOL: BIO 6 a-c
Meiosis: Important Vocabulary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Meiosis: Important Vocabulary ,[object Object],[object Object],[object Object],[object Object]
Meiosis ,[object Object]
Meiosis   ,[object Object],[object Object],Just right! from mom from dad child meiosis reduces genetic content too much!
Meiosis:  cell division in two parts Chromatids separate Sister  chromatids separate Result:  one copy of each chromosome in a gamete. (equational division) 2n n Diploid 2n Diploid Meiosis I (reduction division) Meiosis  II Haploid
Meiosis I : the reduction division Prophase I (early) (diploid) Prophase I (late) (diploid) Metaphase I (diploid) Anaphase I (diploid) Telophase I (diploid) Nucleus Spindle fibers Nuclear envelope
Prophase I   Early prophase Chromatids pair.  Crossing over occurs. Late prophase Chromosomes condense. Spindle forms. Nuclear envelope fragments.
Metaphase I Chromatid pairs align along the equator of the cell.
Anaphase I Chromosomes separate and move to opposite poles. Sister chromatids remain  Attached at their centromeres.
Telophase I Nuclear envelopes reassemble. Spindle disappears. Cytokinesis divides cell into two.
Meiosis II Gene  X Meiosis II produces gametes with  one copy of each chromosome and thus one copy of each gene. Sister chromatids carry  identical genetic  information .
Meiosis II : the equational division Prophase II (diploid) Metaphase II Anaphase II Telophase II Four  Non-identical  haploid  daughter cells
Prophase II Nuclear envelope fragments. Spindle forms.
Metaphase II Chromosomes align  along equator of cell.
Anaphase II Sister chromatids separate and move to opposite poles.
Telophase II Nuclear envelope assembles. Chromosomes unravel. Spindle disappears. Cytokinesis divides cell into two.
Results of meiosis ,[object Object],[object Object]
“ Putting It All Together” - Fertilization
What Meiosis is About Meiosis allows the creation of unique individuals through sexual reproduction.
Mitosis Meiosis Number of divisions 1 2 Number of daughter cells 2 4 Genetically identical? Yes No Chromosome # Same as parent Half of parent Where Somatic cells Sex cells When Throughout life At sexual maturity Role Growth and repair Sexual reproduction
MITOSIS MEIOSIS Occurs in somatic (body) cells Occurs only in gonads (sex organs: ovary/testes) Produces cells for repair, maintenance, growth, asexual reproduction Only produces gametes (sex cells: egg/sperm) Results in identical diploid (2n) daughter cells Reduction division results in 4 haploid (n) cells

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Meio

  • 1. Cell Division SOL: BIO 6 a-c
  • 2.
  • 3.
  • 4.
  • 5.
  • 6. Meiosis: cell division in two parts Chromatids separate Sister chromatids separate Result: one copy of each chromosome in a gamete. (equational division) 2n n Diploid 2n Diploid Meiosis I (reduction division) Meiosis II Haploid
  • 7. Meiosis I : the reduction division Prophase I (early) (diploid) Prophase I (late) (diploid) Metaphase I (diploid) Anaphase I (diploid) Telophase I (diploid) Nucleus Spindle fibers Nuclear envelope
  • 8. Prophase I Early prophase Chromatids pair. Crossing over occurs. Late prophase Chromosomes condense. Spindle forms. Nuclear envelope fragments.
  • 9. Metaphase I Chromatid pairs align along the equator of the cell.
  • 10. Anaphase I Chromosomes separate and move to opposite poles. Sister chromatids remain Attached at their centromeres.
  • 11. Telophase I Nuclear envelopes reassemble. Spindle disappears. Cytokinesis divides cell into two.
  • 12. Meiosis II Gene X Meiosis II produces gametes with one copy of each chromosome and thus one copy of each gene. Sister chromatids carry identical genetic information .
  • 13. Meiosis II : the equational division Prophase II (diploid) Metaphase II Anaphase II Telophase II Four Non-identical haploid daughter cells
  • 14. Prophase II Nuclear envelope fragments. Spindle forms.
  • 15. Metaphase II Chromosomes align along equator of cell.
  • 16. Anaphase II Sister chromatids separate and move to opposite poles.
  • 17. Telophase II Nuclear envelope assembles. Chromosomes unravel. Spindle disappears. Cytokinesis divides cell into two.
  • 18.
  • 19. “ Putting It All Together” - Fertilization
  • 20. What Meiosis is About Meiosis allows the creation of unique individuals through sexual reproduction.
  • 21. Mitosis Meiosis Number of divisions 1 2 Number of daughter cells 2 4 Genetically identical? Yes No Chromosome # Same as parent Half of parent Where Somatic cells Sex cells When Throughout life At sexual maturity Role Growth and repair Sexual reproduction
  • 22. MITOSIS MEIOSIS Occurs in somatic (body) cells Occurs only in gonads (sex organs: ovary/testes) Produces cells for repair, maintenance, growth, asexual reproduction Only produces gametes (sex cells: egg/sperm) Results in identical diploid (2n) daughter cells Reduction division results in 4 haploid (n) cells