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meiosis & mitosis

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adreanna mata

on 21 May 2013

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Transcript of meiosis & mitosis

by: Adreanna Mata
& Nohemi Gonzalez Phases of mitosis Mitosis The division of the nucleus when a plant or animal cell divides for growth or repair (binary fission ).It ensures that the two new nuclei(daughter nuclei)are each given the same number of chromosomes( the bodies which carry the "coded" hereditary information). 1St. Prophase.
the nuclear membrane disappears and the threads of chromatin in the nucleaus coil up to form chromosomes.Each has already duplicated to form two identical,long coils (chromomatids),joined by small sphere (centromere). The two centrioles move to opposite poles (ends) of the cell.
2Nd. Metaphase
the centrioles (now at opposite poles )project protein fibers called spindle fibers which join together and form a sphere, or spindle. the chromosomes (paired chromatids)move toward its equator and become attached by their centromeres to the spindle fibers.

the centromeres duplicate and the two chromatids from eah pair (now called daughter chromosomes) move to opposite poles of the spindle, seemingly "dragged" there by the contracting spindle fibers.
4th. telophase
the spindle fibers and astral rays disappear each group of daughter chromosomes. this inside which the chromosomes uncoil and once again form a thread-like mass (chromatin*). the centrioles also duplicate, so that a pair will be found in each new cell ( after cytokinesis). The division of the nucleus when a cell divides to produce sex cells (see introduction). It can be split into two separate divisions-the first meiotic division (or reduction division) and the second meiotic division each is followed by division of the cytoplasm). These can be divided into different phases (as in mitosis).These can be divided into different phases (as in mitosis).Meiosis in general, and the first meiotic division in particular, ensures that each new daughter nucleus receives exactly half the number of chromosomes as the original nucleus. The original number is the diploid number; the halved amount is the haploid number. A COMPLETE REFERENCE GUIDE TO PHYSICS, CHEMISTRY AND BIOLOGY the short ones
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