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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