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Cell Cycle and Mitosis
EQ:How are cell division and reproduction related?
EQ:Why is it
necessary that the cell cycle be
regulated?
(Drag magnifying glass to the left and right to reveal EQ's)
Why do cells divide??
Cell Growth
Replace damaged or dead cells
Reproduction
Pull down to reveal reasons
Organisms made up of Eukaryotic cells begin their lives as one cell.
These cells become different from each other as they multiply and follow the roles supplied for them by their
DNA.
DNA Review
DNA is a molecule that contains genetic
information carried from the parent to the
offspring
DNA is a long and large molecule that is stored in the nucleus but that must be copied when making a new cell.
DNA is a large molecule that condenses tightly into a chromosome which allows it to move more easily around the cell during division.
The Cell CycleProcess of making new somatic (regular) cells
(ex. skin, digestive, muscle)
The nucleus and cytoplasm divide and form 2 new daughter cells.
The Cell Cycle produces a new cell that is an identical copy to the parent cell. Goes from 46>46 Chromosomes
Begins from the start of one cell division to the beginning of the
next.
Cytokinesisclick to learn more
Parts of the Cell Cycle
Interphase
Mitosisclick to learn more
click to learn more
InterphaseGap 1
Primary growth phase, when the cell does its job. Checkpoint #1
SynthesisDNA is duplicated
or copied
Gap 2Secondary growth phase,
chromosomes condense and organelles replicate. Checkpoint #2
90% of the cell's time is spent in Interphase!
Chromosomes start as threadlike coils of
DNA.Each chromosome and its duplicate change to sister chromatids by
the end.
click here to see what you know so
far...
How well do you know the Cell Cycle so far??
Mitosis
ROPHASE
ETAPAHSE
NAPHASE
ELOPHASE
DRAG TO REVEAL STEPS
(Click on each letter to learn more)
(Click on the picture to watch a short video)
ROPHASE
Centrioles
Sister Chromatids
Usually the longest stage of Mitosis
Centrioles (poles) appear and begin to move to opposite ends
Spindle fibers form between the poles
Nuclear membrane and nucleolus disappears
Drag arrows to learn more
Align on the equator (middle) to form “metaphase plate.” Pull
ETAPHASE
Sister Chromatids (pairs of chromosomes) attach to the spindle
fibers.
Pull
NAPHASE
There are now 2 times the # of chromosomes as the parent
cell.Pull
Chromatids separate and begin to move to opposite ends of the cell, being pulled by the spindle fibers.
Pull
ELOPHASE
Spindle fibers disappearMitosis comes to a closePull
Two nuclei begin to formPull
Chromosomes appear as chromatin
Pull
YTOKINESIS(CYTOPLASM DIVIDES!)
Forms 2 daughter cells, each having a nucleus, that is identical to the
original cell.
Cytoplasm pinches inward
NIMAL CELLS LANT CELLS
A cell wall is formed between the two
daughter cells, like a brick wall being laid.
Cell wall forming
ProphaseMetaphase
AnaphaseTelophase
Cytokinesis
Doughnut Decisions....Determine which step of Mitosis/Cytokinesis the doughnut
is in and then put the doughnuts in the correct order
Click on Doughnut to Reveal Stages & Drag down to reveal Order Answers
#3Prophase, #2Metaphase, #5Anaphase, #4Telophase, #1Cytokinesis
Video Quiz
SMART Notebook
Attachments
Mitosis_Video_Quiz.asf
SMART Notebook
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