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Meiosis Vs. Mitosis 9th grade bio

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Brooke Dooley

on 28 November 2012

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Transcript of Meiosis Vs. Mitosis 9th grade bio

Mitosis vs. Meiosis including the processes, differences, and the common facts! Mitosis Process in which the the nucleus and duplicated chromosomes of a cell divide and are equally distributed, forming two exact daughter cells (asexual reproduction) Result in 46 pieces of DNA in each cell (chromosomes) Chromatin(DNA in a messy ball-like form) and chromosomes (condensed forms of DNA- 2 Chromatids=1 Chromosome) After the cells are produced in Mitosis they begin to grow/ and the cells that divide during Mitosis start to rebuild and grow Interphase Interphase is the period in time in which the cell is not diving (cell in interphase most of life, not mitosis) Interphase includes 3 stages: G 1 stage- occurs after Mitosis and before the "S" stage. The cell grows, produces organelles, and changes shape S (synthesize) stage- occurs after "G " stage and before the "G " stage. Cells duplicates organelles( creates to sets of DNA) 1 2 2 G stage- The cell carries out regular cell duties/actions Mitosis There are four stages of Mitosis: Prohase, Metaphase, Anaphase, and Telophase Prophase DNA in form of chromatin (46 pieces), THERE IS a nuclear envelope and nucleus P
T DNA condenses to chromosomes(can't read instructions)

Nuclear Envelope dissolves(nucleolus disappears)

Centrioles move to opposite sides of cell and grow microtublets(precedes mitotic spindle) Metaphase Cell forms mitotic spindle- the microtublets connect to the chromosomes and line them up single file in the middle and push them around ** some microtublets are not connected to cromosmes Anaphase Microtublet become shorter and pull the chromosomes in half
Cell becomes longer because the microtublets push against it ***** Just because the chromosomes split in half each half is still considered a chromosome Telophase Cytokinesis occurs, separating the cell into 2 parts
The DNA in the 2 parts(cells) turn back to chromatin
Microtubules shrink
The Cytoskeleton appears (gives shape to cell) Meiosis Mitosis Meiosis Both Asexual Reproduction- every offspring (in this case cells) are the exact same when compared to each other Sexual reproduction- each offspring varies Produces two diploid cells( homologous chromsomes) Produces haploid cells(only one chromosome of a homologous pair)
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