the cell cycle the cell cycle. image from purves et al., life: the science of biology, 4th edition,...
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The Cell CycleThe 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)
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InterphaseInterphase
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
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MitosisMitosis
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MitosisMitosis
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.
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ProphaseProphase
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.
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Metaphase and AnaphaseMetaphase 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),
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TelophaseTelophase
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)
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Results of each…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)
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MeiosisMeiosis
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Chromosomes Arranged in a Chromosomes Arranged in a KaryotypeKaryotype
Image from Access Excellence Graphics Gallery http://www.accessexcellence.com/AB/GG/mitosis.html
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Chromosome Structure as related to Chromosome Structure as related to MeiosisMeiosis
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)
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)
Sister chromatids = copies of the chromosomes (DNA wound around proteins)
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Meiosis 1Meiosis 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)
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Meiosis 1Meiosis 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)
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)
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Meiosis 2Meiosis 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)
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),
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Meiosis 2Meiosis 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)
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Sources of VariationSources of VariationCrossing overCrossing over
Independent assortment of chromosomesIndependent assortment of chromosomesSegregation of allele pairs (genes)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)
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Image from Access Excellence Graphic Gallery http://www.accessexcellence.com/AB/GG/comparison.html
Comparison of Mitosis Comparison of Mitosis and Meiosisand Meiosis