Transcript What are the main events of the cell cycle?

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What are the main events
of the cell cycle?
Sections 8.4 thru 8.6
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Chromosomes
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Chromosomes can be
unduplicated (single) or
duplicated (double)
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Duplicated chromosomes are
composed of 2 identical sister
chromatids that are held
together by a centromere
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During cell division the sister
chromatids of a duplicated
(double) chromosome are
pulled apart to form 2
unduplicated (single)
chromosomes
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Chromatin, chromosomes,
chromatid…
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Chromatin – DNA when it is
loose and threadlike
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Chromosome – DNA when it
condensed; can be single or
double
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Chromatid – half of a
duplicated (double)
chromosome
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Cell Cycle
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Cell Cycle
Interphase – the phase of the cell
cycle in which the cell spends
the majority of its time and
performs its function; nuclear
membrane is in tact; DNA in the
form of chromatin; nucleolus is
visible; made up of 3 stages
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G1 (first gap) – during this
time the cell is growing and
carrying out its function
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S (DNA synthesis) – during this
time DNA is replicated
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G2 – (second gap) – during
this time the cell continues to
grow and prepares to for cell
division
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Cell Cycle
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M Phase (mitotic phase) – the
phase of the cell cycle when
the cell is dividing; made up of
two stages
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Mitosis – division of the
nucleus; has 4 phases:
prophase, metaphase,
anaphase, and telophase;
some books have a 5 phase
– prometaphase between
prophase and metaphase
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Cytokinesis – division of the
cytoplasm; begins during
telophase of mitosis