cell cycle (mitosis) · the main stages of the cell cycle are gap 1, synthesis, gap 2, and mitosis....
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Cell Cycle (Mitosis)
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Tennessee State StandardCell Biology (Cell Cycle &Mitosis)1. Identify and interpret the steps of the
cell cycle from experimental data
2. Identify correctly w/ 85% accuracy
steps of mitosis
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Cell Cycle 6 phases
InterphaseProphaseMetaphaseAnaphaseTelophaseCytokinesis
Phases of
Mitosis
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The Complete Cell Cycle
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The main stages of the cell cycle are gap 1, synthesis, gap 2, and mitosis.
– Gap 1 (G1): cell growth and
normal functions
– DNA synthesis (S): copies
DNA
– Gap 2 (G2): additional
growth (chromatids become
replicated chromosomes)
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Chromosome Structure
Centromere
• 6.5 feet of DNA per cell
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Chromosome Structure
1 chromatid1 chromatid
So 1 chromatid
+ 1 chromatid =
1 Chromosome
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The DNA
condenses
by folding
itself around
proteins
called
HISTONES
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InterphaseTHE CELL:grows to it’s mature size
makes a _____ of its
DNA
prepares to _______ into
two cells
Copy
Divide
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Prophase
the __________ condenses (gets thicker) to form chromosomes, which are two chromatids attached by a ____________.
_______ fibers stretch out to opposite ends of the cell
the nucleus breaks down
Chromatin
CentromereSpindle
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Metaphase
the __________ line
up in the middle of the
cell
spindle fibers attach to
the __________ of the
chromosomes
Chromosomes
Centromere
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Anaphase
____________ split and the chromatids separate
chromatid to opposite ends of the cell being pulled by the ___________
the cell begins to become
stretched out
Centromeres
Spindle Fibers
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Telophase
the __________
reappears – two nuclei
but one cell
chromosomes begins
to loosen up (start to
become string again)
Nucleus
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Cytokinesis
the cell divides and two
new ___________ cells
are formed
chromosomes loosen up
and become chromatin
again
Daughter
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Cytokinesis in Animal Cells
In animal cell, the
_______________is
where the pinching of
two cells begin
Cleavage Furrow
Cleavage furrow
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Cytokinesis in Plant Cells
In plant cell, the
_________is where the
pinching of two cells
begin
Cell Plate
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Phases of Mitosis Prophase
Centrosomes have duplicated Chromatin condenses into chromosomes Spindles forming Nucleolus and nuclear envelope disappear
Metaphase Centromeres/chromosomes aligned along middle Spindles attach to kinetochore
Anaphase Sister chromatids are pulled apart and daughter chromosomes move
toward opposite poles. Cleavage furrow begins to form
Telophase Nuclear envelope and nucleolus reappear. Chromosomes begin to uncoil
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Terms to knowSister chromatid- contain 2 identical
chromatids held together by centromere
Diploid- 2 sets of chromosomes usually written as 2n
Haploid- 1 set of chromosomes usually written as 1n or n
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Mitosis Power Point Quiz
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Interphase
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Prophase
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Metaphase
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Anaphase
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Telophase and/or Cytokinesis
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Telophase
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Metaphase
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Interphase
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Prophase
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Anaphase
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Prophase
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Anaphase
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Cytokinesis
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Metaphase
Chromosomes align along the middle
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Prophase
Spindle fibers form
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Telphase
Nuclear envelope appears
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Prophase
Chromosomes appear
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Telophase
Chromosomes uncoil
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Anaphase
Chromosomes move to opposite poles
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Interphase
Growth and preparation for division
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Anaphase
Centromeres divide