Meiosis+vs.+Mitosis

= **MEIOSIS VS. MITOSIS**  =

Mitosis:
Mitosis is simply a cell division. In Mitosis, there are two identical cells in the end. It is a division of the nucleus, this process is also called Karyokinesis. Mitosis has four stages. This is mostly to produce two daughter cells. Every single cell is affected is affected by Mitosis except the brain cells., which never divide. The four stages of Mitosis are Prophase, Metaphase, Anaphase and Telophase.
 * In Prophase the Nucleolus and the nuclear membrane are broken down. The Kinetochores attach to the centromeres of the chromosome.
 * In Metaphase Chromososmes attach to the Kinetochore fibers and they all move to the the ceter. Chromosomes align at the equator.
 * In Anaphase sister chromatids are pulled on to opposite sides of the poles of the cells by shortening the kinetochore fibers. This step passes by really fast.
 * In Telophase the spindle dissasembles and the nucleolus reappers. The nuclear envelope occurs around each set of chromatids. The chromosomes appear as chromatin.



Meiosis:
Meiosis is a cell division that happens for gamete cells. There are two steps to this type of cell division which are Meiosis I and Meiosis II. This is started with forty-six double stranded chromosomes. After the first division there is twenty-three double stranded chromosomes. After the second division there are twenty-three single stranded chromosomes. This happens in germ cells that produce gametes. In Meiosis I the stages are are Prophase I, Metaaphase I, Anaphase I and Telophase I.


 * In Prophase 1 crossing over occurs, the nuclear envelope fragments, the spindle forms and the chromosomes condense.
 * In Metaphase 1 the homologous pairs align along the equator of the cell.
 * In Anphase 1 the homologs seperate and move to opposite poles. The sister chromatids rfemain attached to their centromeres.
 * In Telophase 1 the nuclear envelope reassembles, the spindle dissapears and the cell divides into two by cytokinesis.

The stages in MeiosisII are Prophase II, Metaphase II, Anaphase II, Telophase II.


 * In Prophase II the nuclear envelope fragments and the spindle reappers.
 * In Metaphase II the chromosomes align along the equator.
 * In Anaphase II the sister chromatid seperate and move to opposite poles.
 * In Telophase II the nuclear envelope assembles and the chromoomes decondense. The spindle dissapears and cytokinesis divides the vell into two.