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Biology lecture 3
- 1. Cellular Division copyright cmassengale
- 5. Identical Daughter Cells Parent Cell Two identical daughter cells copyright cmassengale
- 13. Boy or Girl? Y - Chromosome X - Chromosome The Y Chromosome Decides copyright cmassengale
- 14. Cell Reproduction copyright cmassengale
- 16. Cell Division in Prokaryotes copyright cmassengale
- 18. Prokaryotic Cell Undergoing Binary Fission copyright cmassengale
- 19. Animation of Binary Fission copyright cmassengale
- 20. The Cell Cycle copyright cmassengale
- 22. Cell Cycle copyright cmassengale
- 26. What’s Happening in Interphase? What the cell looks like Animal Cell What’s occurring copyright cmassengale
- 27. Sketch the Cell Cycle Daughter Cells DNA Copied Cells Mature Cells prepare for Division Cell Divides into Identical cells copyright cmassengale
- 33. Late Prophase Nucleus & Nucleolus have disintegrated Chromosomes copyright cmassengale
- 34. Spindle Fiber attached to Chromosome Kinetochore Fiber Chromosome copyright cmassengale
- 35. Review of Prophase What the cell looks like What’s happening copyright cmassengale
- 37. Sketch The Spindle copyright cmassengale
- 39. Metaphase Chromosomes lined at the Equator Asters at the poles Spindle Fibers copyright cmassengale
- 40. Metaphase Aster Chromosomes at Equator copyright cmassengale
- 41. Review of Metaphase What the cell looks like What’s occurring copyright cmassengale
- 43. Anaphase Sister Chromatids being separated copyright cmassengale
- 44. Anaphase Review What the cell looks like What’s occurring copyright cmassengale
- 46. Comparison of Anaphase & Telophase copyright cmassengale
- 48. Cytokinesis Cleavage furrow in animal cell Cell plate in plant cell copyright cmassengale
- 49. Mitotic Stages copyright cmassengale
- 51. Identical Daughter Cells Chromosome number the same , but cells smaller than parent cell What is the 2n or diploid number? 2 copyright cmassengale
- 52. Review of Mitosis copyright cmassengale
- 53. Draw & Learn these Stages copyright cmassengale
- 54. Draw & Learn these Stages copyright cmassengale
- 55. Name the Mitotic Stages: Interphase Prophase Metaphase Anaphase Telophase Name this? Name this? copyright cmassengale
- 57. Mitosis Animation Name each stage as you see it occur? copyright cmassengale
- 58. Mitosis in Onion Root Tips Do you see any stages of mitosis? copyright cmassengale
- 59. Test Yourself over Mitosis copyright cmassengale
- 60. Mitosis Quiz copyright cmassengale
- 61. Mitosis Quiz copyright cmassengale
- 62. Name the Stages of Mitosis: Interphase Early prophase Mid-Prophase Late Prophase Metaphase Late Anaphase Early Anaphase Early Telophase, Begin cytokinesis Late telophase, Advanced cytokinesis copyright cmassengale
- 63. Identify the Stages Early, Middle, & Late Prophase Late Prophase Metaphase Anaphase Late Anaphase Telophase Telophase & Cytokinesis ? ? ? ? ? ? ? copyright cmassengale
- 64. Locate the Four Mitotic Stages in Plants Metaphase Prophase Anaphase Telophase copyright cmassengale
- 66. Meiosis Formation of Gametes (Eggs & Sperm) copyright cmassengale
- 71. Fertilization – “Putting it all together” 1n =3 2n = 6 copyright cmassengale
- 73. A Replicated Chromosome Gene X Homologs separate in meiosis I and therefore different alleles separate. copyright cmassengale Homologs (same genes, different alleles) Sister Chromatids (same genes, same alleles)
- 75. Meiosis: Two Part Cell Division Homologs separate Sister chromatids separate Diploid Diploid Haploid copyright cmassengale Meiosis I Meiosis II
- 76. Meiosis I: Reduction Division Early Prophase I (Chromosome number doubled ) Late Prophase I Metaphase I Anaphase I Telophase I (diploid) copyright cmassengale Nucleus Spindle fibers Nuclear envelope
- 78. Tetrads Form in Prophase I Homologous chromosomes (each with sister chromatids) Join to form a TETRAD Called Synapsis copyright cmassengale
- 80. Homologous Chromosomes During Crossing-Over copyright cmassengale
- 81. Crossing-Over Crossing-over multiplies the already huge number of different gamete types produced by independent assortment copyright cmassengale
- 82. Metaphase I Homologous pairs of chromosomes align along the equator of the cell copyright cmassengale
- 83. Anaphase I Homologs separate and move to opposite poles. Sister chromatids remain attached at their centromeres . copyright cmassengale
- 84. Telophase I Nuclear envelopes reassemble. Spindle disappears. Cytokinesis divides cell into two. copyright cmassengale
- 86. Meiosis II: Reducing Chromosome Number Prophase II Metaphase II Anaphase II Telophase II 4 Genetically Different haploid cells copyright cmassengale
- 87. Prophase II Nuclear envelope fragments. Spindle forms. copyright cmassengale
- 88. Metaphase II Chromosomes align along equator of cell. copyright cmassengale
- 89. Anaphase II Sister chromatids separate and move to opposite poles . Equator Pole copyright cmassengale
- 90. Telophase II Nuclear envelope assembles. Chromosomes decondense. Spindle disappears. Cytokinesis divides cell into two. copyright cmassengale
- 91. Results of Meiosis Gametes (egg & sperm) form Four haploid cells with one copy of each chromosome One allele of each gene Different combinations of alleles for different genes along the chromosome copyright cmassengale
- 92. Meiosis Animation copyright cmassengale
- 93. Gametogenesis Oogenesis or Spermatogenesis copyright cmassengale
- 95. Spermatogenesis in the Testes Spermatid copyright cmassengale
- 98. Oogenesis in the Ovaries copyright cmassengale
- 99. Oogenesis copyright cmassengale Oogonium (diploid) Mitosis Primary oocyte (diploid) Meiosis I Secondary oocyte (haploid) Meiosis II (if fertilization occurs) First polar body may divide (haploid) Polar bodies die Ovum (egg) Second polar body (haploid) a A X X a X A X a X a X Mature egg A X A X
- 100. Comparing Mitosis and Meiosis copyright cmassengale
- 101. Comparison of Divisions copyright cmassengale 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 Germ cells When Throughout life At sexual maturity Role Growth and repair Sexual reproduction
Notas del editor
- Replication is the process of duplicating chromosome. The new copy of a chromosome is formed by DNA synthesis during S-phase. The chromosome copies are called sister chromatids. Sister chromatids are held together at the centromere.