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is the period from the time a new cell is formed until it finishes dividing to form 2 new cells |
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include the total period from cell formation to cell division (the period between nuclear division) |
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chromosomes condense and become visible nuclear membranes and nucleous disappear, microtubules assemble to form spindles apparatus |
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chromosomes line up across cell equator on metaphase plate, chromosomes can be counted |
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chromotids are separated and one chromatid is pulled to each pole (opposite sides of cell) pulling is done by microtubules of spindle |
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| nuclei reform, chromosomes and spindle disappear, cell divides |
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| has the same steps, but the nucleus divides twice, the two separate divisions are meiosis I and II. At the end of meiosis there are four haploid nuclei which contain only 23 chromosmes each: one of each of the 22 autosomes and one sex chromosome |
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| Most of the cell cycle is spent in interphase – this is when most cell metabolism occurs. During interphase, most chromosomes are dispersed and active, so genes can be copied to direct the synthesis of new proteins. Interphase is made up of G1 (period of growth following cell division), S phase (when the DNA is replicated in preparation for division), and G2 (second period of growth prior to next mitosis). |
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| S phase (when the DNA is replicated in preparation for division), and G2 (second period of growth prior to next mitosis). |
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| Nuclear division (karyokinesis) |
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| Nuclear division (karyokinesis) can be either mitosis or meiosis; mitosis is how most cells in your body divide and multiply |
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| period of growth following cell division |
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| period of growth prior to next mitosis |
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| period during the stage of G1 and G2, a period when the decision is made to either continue progressing towards cell division or to stop for awhile and carry out needed DNA or cell repairs or processes. After G2 the cell undergoes nuclear division (m) and usually cytoplasmatic division |
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