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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.

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Presentation on theme: "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."— Presentation transcript:

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

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 ence.com/AB/GG/comp arison.html Comparison of Mitosis and Meiosis


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