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Minggu, 16 Agustus 2009

Biology (Matter)


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Mitosis vs. Meiosis

Stages Meiosis Mitosis
Interphase - begins with a diploid cell - begins with a diploid cell
Prophase - four chromosomes combine to form two tetrads
- the chromosomes in the tetrad cross over each other, allowing them to exchange genetic material
- four chromatids combine to form two chromosomes linked by a centromere
Metaphase - the two tetrads line up in the center - the two chromosomes line up in the center
Anaphase - the two tetrads split up into four chromosomes which go to both poles - the two chromosomes split up into four chromatids which move to both of the poles
Telophase - the two sets of chromosomes become enclosed by the nuclear envelope - the two sets of chromatids are enclosed by the nuclear envelope
Cytokenesis - two cells are formed with two sets of chromosomes in each one - two cells are created with two chromatids in each one.
- mitosis is now complete.
Prophase II - DNA replication is skipped and the two cell's nuclear envelope are dissolved and the spindle reformed
- the four chromatids in each cell are connected together to form two chromosomes

Metaphase II - the two chromosomes line up in the center
Anaphase II - the two chromosomes are split up into their daughter chromatids and moved towards opposites poles
Telophase II - the nuclear envelope is reformed around the two poles on each cell.
Cytokenesis - the cells are split up again and four haploid cells remain as a result
- meiosis is now complete




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