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Cell Division

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sara murtaja

on 9 June 2015

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Transcript of Cell Division

Cells divide for reproduction, replacement of lost or dead cells, and for growth.

Why do Cells
Divide?

Cell Division
Mitosis and Meiosis

What is interphase?
The resting phase between successive mitotic divisions of a cell, or between the first and second divisions of meiosis.
*Before Mitosis and Meiosis occurs in the cell cycle, interphase occurs!!
Interphase

THERE ARE FIVE PHASES IN INTERPHASE
(CELL CYCLE)
The Phases in order are..
1.G1 (cell growth)
2.S (DNA synthesis)
3.G2 ( Growth and preparation for Mitosis)
4.Mitosis (P.M.A.T)
5.Cytokinesis

The Phases of INTERPHASE

Where does Mitosis occur and What is the process?
In eukaryotic cells, a process of cell division that forms two new nuclei, each of which has the same number of chromosomes.
What does Mitosis produce and Why?
Mitosis produces new cells that are identical to original cells and allows ...

Mitosis
Meiosis
Process of Meiosis I
Meiosis I (Interphase)
Meiosis is a process where a single cell divides twice to produce four cells containing half the original amount of genetic information.
Reduce the number of chromosomes in each cell.
Meiosis undergoes two nuclear divisions: Meiosis I and Meiosis II.
Interphase I - G1 phase is when the cell simply gets bigger. S (synthesis) phase is when the DNA gets replicated. G2 is a second growth stage, any final growing or doubling of other cell contents is done here.
organisms to grow, replace damaged tissues,
and reproduce asexually in some organisms.

MITOSIS OCCURS IN FOUR STAGES
1.PROPHASE
2.METAPHASE
3.ANAPHASE
4.TELOPHASE

Continue..

P.M.A.T

PROPHASE- (PREP) The nucleus envelop disappears and the chromosomes are condensing.
METAPHASE- (MIDDLE) The chromosomes line up at the equator of the cell.
ANAPHASE- (AWAY) The chromosomes move away to the opposite sides of the cells ( poles )with the help of spindle fibers.
TELOPHASE-(TWO) The nuclei are forming on each side of the cell to make the two cells .
Cytokinesis
Separating the actual cell
Summary of the Mitosis
Asexual reproduction
Produces 2 identical daughter cells
Daughter cells are diploid
Daughter cells are identical to parent/mother cell.
P.M.A.T
Prophase I- The nuclear envelope starts to disintegrate & the spindle fibers start to form. Homologous chromosomes line up next to each other and crossing over occurs.
Metaphase I- Homologous chromosomes line up at the equator of the cell and assort independently.
Anaphase I- The chromosomes move apart to the opposite ends of the cell. The homologous pairs separate into two different cells,
Telophase I- The spindle fibers denigrates and cytokinesis begins.

Meiosis II
No interphase II because we do not want to redouble our DNA.
Prophase II- Spindle fibers start to form at the opposite ends of the cell.
Metaphase II- The chromosomes line up along the equator of the cell.
Anaphase II- The sister chromatids move away from each other along the spindle fibers.
Telophase II & Cytokinesis- We see the development of four genetically different haploid cells.
Process of Meiosis II
Resources

Mitosis booklet (Biology Textbook)
Youtube video (Mitosis & Meiosis-Ameba Sisters)
Process of Mitosis
Full transcript