cell reproduction in bacteria binary fission: asexual reproduction producing genetically identical...
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Cell Reproduction in Bacteria
Binary Fission: asexual reproduction producing genetically identical cells
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Cell Cycle: Eukaryotes• Growth1:
– Cell increases in size
– Prepares for division
• Synthesis:– replicates
the genetic material
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Cell Cycle • Growth 2:– Continue to
grow
• Mitosis– Nucleus
divides
• Cytokinesis:– Cell splits
• Interphase
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4 Stages
• Prophase
• Metaphase
• Anaphase
• Telophase
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Prophase
• coiling of DNA into chromosomes
• Nucleolus and nuclear membrane break down and disappear
• Centrosomes appear
• Spindle fibers appear– Mitotic spindle
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Metaphase• Kinetochore
fibers move chromosomes to the middle
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Anaphase
• Chromatids of each chromosome separate at the centromere
• Move towards opposite poles
*Now called individual chromosomes
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Telophase
• Spindle fibers disassemble
• Chromosomes uncoil to chromatin state
• Nuclear envelope forms
• Nucleolus forms
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Cytokinesis
• Cell membrane pinches inward
• Cleavage furrow: point at where two cells separate
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Cleavage furrowCleavage
furrow
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Meiosis: production of gametes
Diploid cell producing 4 haploid cells: 4 pollen grains
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