Mitosis and the Cell Cycle

Mitosis and the Cell Cycle - Prokaryotes Have a Simple Cell...

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Prokaryotes Have a Simple Cell Cycle Cell division in prokaryotes takes place in two stages The DNA is replicated The cell elongates, then splits into two daughter cells The process is called binary fission
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Cell division in prokaryotes
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Eukaryotes Have a Complex Cell Cycle Cell division in eukaryotes is more complex than in prokaryotes because 1. Eukaryotic contain far more DNA 2. Eukaryotic DNA is packaged differently It is in linear chromosomes compacted with proteins
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Eukaryotes Have a Complex Cell Cycle Eukaryotic cells divide in one of two ways Mitosis Occurs in somatic (non-reproductive) cells Meiosis Occurs in germ (reproductive) cells Results in the production of gametes
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The complex cell cycle of eukaryotic cell is composed of several stages G phase Primary growth phase S phase DNA replication G phase Microtubule synthesis M phase Chromosomes pull apart C phase Cytoplasm divides Interphase Mitosis Cytokinesis
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How the cell cycle works
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Chromosomes Chromosomes were first observed by the German embryologist Walther Fleming in 1882 The number of chromosomes varies enormously from species to species The Australian ant Myrmecia spp. has only 1 pair Some ferns have more than 500 pairs Chromosomes exist in somatic cells as pairs Homologous chromosomes or homologues
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Diploid cells have two copies of each chromosomes Replicated chromosomes consist of two sister chromatids These are held together at the centromere
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Mitosis and the Cell Cycle - Prokaryotes Have a Simple Cell...

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