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Cell Division Loren Safta
Transcript of Cell Division Loren Safta
To build a Cell City
design by Dóri Sirály for Prezi
The Essence Of Life
Everything that is alive on this planet, has cells. Some organisms, such as bacteria, are single-celled organisms. Meaning, they only have one cell. Others, such as giraffes, trees and you and me, are multi-celled organisms. We have billions of cells in our bodies. Although all living things eventually die. So, how are we creating new cells?
The Steps of cell division
All cells, whether plant or animal, single-celled or multi-celled, use cell division to reproduce into more cells
This cycle contains three main stages:
Mitosis is a little different than the rest. it is made up of a series of phases known as:
This is the first stage of the cell cycle.
During this stage, the cell grows twice its size to be able to split into two new cells called "daughter cells". The cell also replicates its DNA, which will be given to the two new "daughter cells". This way, each "daughter cell" will have an exact replica of the DNA of the original cell.This is the longest process of the cell cycle.It will last 19 hours.
So, Now We Have Built Our Cell City!
As we know, mitosis is divided into 4 separate parts, prophase, metaphase, anaphase and telaphase. Each Phase is important and different.
Entering phase one of mitosis: Prophase!
During prophase, the chromatin condenses to form into chromosomes. chromosomes are rodlike. thetwo strands of condensed chromatin are held together by something called the centomere.
the nuclear membrane also breaks down around the chromosomes. and spindle fibers begin to bridge across the cell
The second stage of Mitosis is Metaphase
The chromosomes line up at the center of the cell. they attach to the spindle fibers at their centomeres
This is the last stage of mitosis, telephase. When telephase takes place, the chromosomes stretch and lose their rodlike appearence. a new nuclear membrane forms around the two reigions of chromosomes at opposit ends of the cell.
Cells were first discovered by Robert Hooke. Using the first microscope (A compound microscope) he observed a peice of cork under it and saw millions of dead cells. This amazed him. The sheer number of cells he called
The next stage of mitosis is anaphase. during anaphase, the cetomere of the chromosomes split. and the chormosomes are now seperate. the two chromatid move away from each other across the spindle fibers to opposit ends of the cells. the ends pull apart and the cell stretches.
The Final Stretch!
During Cytokenesis, the cell membrane pinches around the middle of the cell. eventually, the cell splits in two. now each daughter cell has the same amount of chromosomes, half the organelles and the cytoplasm.
Time for each phase
All Information is from Prentice halls science explorer.
All pictures are from prezi google pictures.