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The Cell Cycle/Division/Mitosis
Unit 4
The Cell CycleInterphase
MitosisCytokinesis
Cyclin
CDKClick here for
definition
(Synthesis)
Cell Cycle ExpandedM phase has 4 stages plus Cytokinesis!!
Movie
Interphase Performs normal activities
for life.
• G1-Grows• S-Replicates/synthesizes
the DNA(genetic material)
• G2-Grows
DNA is in the chromatin state
(kind of like spaghetti)
What are the stages/phases of Mitosis?
Centrioles appear
Centrioles move
Spindle fibers
grow from
the centrioles
center of the cell
(DNA/Chromosomes)
•Two new nuclei form •Cell membrane pinches in
Cytokinesis This process ends the cell cycle.
Cytokinesis
new
CELLS AFTER COMPLETING THE CELL CYCLE
How is mitosis different in plant and animal cells?
During Telophase and Cytokinesis in
Plant cell--a cell wall forms between the two daughter cells
Animal cell --cell membrane pinching in for cytokinesis no cell wall forms
Interphase Prophase Metaphase
AnaphaseTelophase
Animal Cell
Plant Cells
Understanding Chromosomes
The genetic material inside the nucleus goes by many different names. The name depends on how it is packaged or where it is located in the cell.
Understanding Chromosomes
Protein
Sister ChromatidsNucleus
Tightly coiled DNA strand
Centromere
Chromosome number during the Cell Cycle
2 4 4 4
2
2
Interphase
Cytokinesis
Asexual Reproduction
When one organism produces one or more new organisms that can live on their own.
•Reproduction without sperm and egg uniting.
Binary fissionParent cell splits in two, producing identical daughter cells.
Not mitosis because there is no nucleus but the DNA does get copied and transferred to the next generation.
BuddingOrganisms produce buds “mini-me” that will
grow into a genetically identical adult.
Bud
Yeast (unicellular) Hydra (Multicellular)
Regeneration
New tissue growth at the site of a wound
Propagating Plants from Stem Cuttings (a type of Regeneration)
Why Choose Asexual Reproduction?--Advantages
• Rapid population growth• No fertilization of an egg
cell-no need of a partner.• Organism can remain in
one particular place • Genetically identical
copies of the parent-- adapted to the environment.
Each spot on this Petri dish is a bacterial colony started by one bacterium.By the time a colony is visible to the human eye, it consists of at least one million cells.
Disadvantages of Asexual Reproduction?
• No genetic difference, change is environment can be deadly to entire population.
• Any mutations or "bad" qualities will be passed on.
Streptococcus bacteria.
Strep Throat infection
Antibiotic change the environment for the bacteria that cause Strep-throat. Inmost casesall of thebacteriawill die.
• CDK- a molecule that plays a key role in controlling the cell cycle.
• Cyclin-regulates CDK
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Modified by R. O’Connor 10/10