the cell cycle interphase , mitosis, and cytokinesis
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The Cell Cycle Interphase , Mitosis, and Cytokinesis. 10-2. Learning Goals. 1. Summarize the cell cycle and what it results in. 2. Describe the function of the cell cycle in both a unicellular and multicellular organism. 3. Define chromosome and describe its parts. - PowerPoint PPT PresentationTRANSCRIPT
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The Cell CycleInterphase, Mitosis, and
Cytokinesis10-2
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Learning Goals1. Summarize the cell cycle and what it
results in.2. Describe the function of the cell cycle in
both a unicellular and multicellular organism.3. Define chromosome and describe its parts.4. Describe what happens to the
chromosomes in each of the 6 steps of the cell cycle.
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Cell CycleCell Cycle - cell division that results in 2 new daughter cells that are an exact copy of the original (parent) cell.
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The Cell CycleThree Main Stages: a) Interphase (95%)b) Mitosis (5%)c) Cytokinesis M Phase
M phase = cell division
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Function Unicellular organisms reproduce
this way (asexual reproduction) Multicellular organisms make
new cells this wayCauses organisms to growTo replace old worn out cellsRepair damaged cells
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Chromosomes Carry genetic information• DNA = genetic code
Every organism has a different # of chromosomes ex: humans have 46 (23 from
mom & 23 from dad)
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One chromosome = pair of sister chromatids
Sister Chromatid = 1 copy of wound up DNA
Sister chromatids are held together by a centromere
centromere
Sister chromatid
Sister chromatid
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Interphase
Prophase
MetaphaseThe Cell Cycle Mitosis
Anaphase
Telophase
Cytokinesis
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Interphaseoccurs before mitosis begins
Chromosomes, cytoplasm, and organelles are copied.
The cell grows
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MitosisProphase
Metaphase Mitosis
Anaphase
Telophase
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Prophase1st step in Mitosis
The genetic material (DNA) condenses into bundles called chromosomes.
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Nuclear membrane disappears
Spindle fibers formCentrioles move to opposite sides of the cell
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Metaphase2nd step in Mitosis
The chromosomes line up along the middle of the cell
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Spindle fibers attach to the centromeres of chromosomes
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4.Anaphase3rd step in Mitosis
Sister chromatids separate and move to opposite sides of the cell
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Telophase4th step in Mitosis
Nuclear membrane forms around each set of chromosomes
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Chromosomes unwind into chromatin
Spindle fibers disappear
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Now you try!Identify the 4 steps of mitosis on the next slide (Hint: They are not in order)
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Metaphase
Telophase
Anaphase
Prophase
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Cytokinesisoccurs after mitosis
The cytoplasm splits in two
Result is two identical cells that have the same number of chromosomes as the original cell.
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Learning Goals1. Summarize the cell cycle and what it
results in.2. Describe the function of the cell cycle in
both a unicellular and multicellular organism.3. Define chromosome and describe its parts.4. Describe what happens to the
chromosomes in each of the 6 steps of the cell cycle.