1. The Cell Cycle The cell cycle. Image from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com)www.sinauer.comwww.whfreeman.com

2. Interphase Not a part of cell division – consists of 3 stages: -G1 (first growth stage) addition of biomass and size -S (synthesis) DNA replication -G2 (second growth stage) reproduction/manufacture of enough organelles for 2 cells

3. Mitosis

4. Mitosis The events of Prophase. Image from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com), used with permission.www.sinauer.comwww.whfreeman.com

5. Prophase The events of Prophase. Image from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com), used with permission.www.sinauer.comwww.whfreeman.com

6. Metaphase and Anaphase The events of Metaphase and Anaphase. Image from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com),www.sinauer.comwww.whfreeman.com

7. Telophase The events of Telophase. Image from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com)www.sinauer.comwww.whfreeman.com

8. Results of each… Mitosis: 2 genetically identical daughter cells that are diploid (with pairs of chromosomes) Meiosis: 4 genetically diverse daughter cells that are haploid (with half of each chromosome pair)

9. Meiosis

10. Chromosomes Arranged in a Karyotype Image from Access Excellence Graphics Gallery http://www.accessexcellence.com/AB/GG/mitosis.html

11. Chromosome Structure as related to Meiosis Structure of a eukaryotic chromosome. Image from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com)www.sinauer.comwww.whfreeman.com Structure and main features of a spindle apparatus. Image from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com)www.sinauer.comwww.whfreeman.com Sister chromatids = copies of the chromosomes (DNA wound around proteins)

12. Meiosis 1 Major events in Prophase I. Image from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com)www.sinauer.comwww.whfreeman.com

13. Meiosis 1 Events in prophase and metaphse I. Image from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com)www.sinauer.comwww.whfreeman.com The events of Telophase I. Image from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com)www.sinauer.comwww.whfreeman.com

14. Meiosis 2 The events of Prophase II. Image from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com)www.sinauer.comwww.whfreeman.com The events of Metaphase II and Anaphase II. Image from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com),www.sinauer.comwww.whfreeman.com

15. Meiosis 2 The events of Telophase II. Image from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com)www.sinauer.comwww.whfreeman.com

16. Sources of Variation Crossing over Independent assortment of chromosomes Segregation of allele pairs (genes) Crossing-over between homologous chromosomes produces chromosomes with new associations of genes and alleles. Image from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com)www.sinauer.comwww.whfreeman.com

17. Image from Access Excellence Graphic Gallery http://www.accessexcell ence.com/AB/GG/comp arison.html Comparison of Mitosis and Meiosis