Date post: | 23-Dec-2015 |
Category: |
Documents |
Upload: | melvin-chambers |
View: | 220 times |
Download: | 0 times |
The Cell CycleInterphase, 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.
4. Describe what happens to the chromosomes in each of the 6 steps of the cell cycle.
Cell Cycle
Cell Cycle - cell division that results in 2 new daughter cells that are an exact copy of the original (parent) cell.
The Cell Cycle
Three Main Stages: a) Interphase (95%)b) Mitosis (5%)c) Cytokinesis M Phase
M phase = cell division
Function Unicellular organisms
reproduce this way (asexual reproduction)
Multicellular organisms make new cells this way
Causes organisms to growTo replace old worn out cellsRepair damaged cells
Chromosomes Carry genetic information• DNA = genetic code
Every organism has a different # of chromosomes ex: humans have 46 (23 from
mom & 23 from dad)
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
Interphase
Prophase
Metaphase
The Cell Cycle MitosisAnaphase
Telophase
Cytokinesis
Interphaseoccurs before mitosis begins
Chromosomes, cytoplasm, and organelles are copied.
The cell grows
MitosisProphase
Metaphase Mitosis
Anaphase
Telophase
Prophase1st step in Mitosis
The genetic material (DNA) condenses into bundles called chromosomes.
Nuclear membrane disappears
Spindle fibers form
Centrioles move to opposite sides of the cell
Metaphase2nd step in Mitosis
The chromosomes line up along the middle of the cell
Spindle fibers attach to the centromeres of chromosomes
4.Anaphase3rd step in Mitosis
Sister chromatids separate and move to opposite sides of the cell
Telophase4th step in Mitosis
Nuclear membrane forms around each set of chromosomes
Chromosomes unwind into chromatin
Spindle fibers disappear
Now you try!
Identify the 4 steps of mitosis on the next slide (Hint: They are not in order)
Metaphase
Telophase
Anaphase
Prophase
Cytokinesisoccurs after mitosis
The cytoplasm splits in two
Result is two identical cells that have the same number of chromosomes as the original cell.
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.
4. Describe what happens to the chromosomes in each of the 6 steps of the cell cycle.