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Thread: Cell Cycle & Mitosis/Meiosis Questions

  1. #1 Cell Cycle & Mitosis/Meiosis Questions 
    Forum Freshman SapereAude's Avatar
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    I am looking for some clarifications as I am studying for a test.

    1) What are the potential consequences when the cell cycle is not controlled? My guess is mutations and cancer; is that correct?

    2) I need to compare and contrast mitosis vs meiosis

    a) What type of cells undergo each process?
    - Mitosis = skin, bone, blood (A sexual)
    - Meiosis = testes, ovaries (sexual)

    b) Division of one parent cell results in how many daugher cells?
    - Mitosis = 2
    - Meiosis = ??????

    c) If human skin cell undergoes mitosis how may chromosomes are in each daughter cell?

    d) If a human testes cell undergoes meiosis how may chromosomes are in each sperm?

    e) Are daughter cells genetically identicle to one another????

    3) What are 3 sources of genetic variation in sexual organisms?


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  3. #2 Re: Cell Cycle & Mitosis/Meiosis Questions 
    Forum Cosmic Wizard paralith's Avatar
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    Quote Originally Posted by SapereAude
    I am looking for some clarifications as I am studying for a test.

    1) What are the potential consequences when the cell cycle is not controlled? My guess is mutations and cancer; is that correct?
    Think about each cell stage. Think about what would happen if a given stage simply went on forever and never stopped. Or what would happen if the cycle was sped up, effectively skipping some stages? Cancer is but one of the things that can result from certain malfunctions in cell cycle control. Mutations aren't a direct result of cell cycle problems, other than the fact that the more times a cell divides, the more chances it's had to make a mistake during replication. so increased division frequency will lead to faster mutation accumulation.

    2) I need to compare and contrast mitosis vs meiosis

    a) What type of cells undergo each process?
    - Mitosis = skin, bone, blood (A sexual)
    - Meiosis = testes, ovaries (sexual)

    b) Division of one parent cell results in how many daugher cells?
    - Mitosis = 2
    - Meiosis = ??????
    for a), pretty much all somatic cells go through mitosis at some point during the organism's lifetime. as for b), c'mon, that one's easy. Think about the process of meiosis. If you need more clues simply look up meiosis on wikipedia.

    c) If human skin cell undergoes mitosis how may chromosomes are in each daughter cell?

    d) If a human testes cell undergoes meiosis how may chromosomes are in each sperm?

    e) Are daughter cells genetically identicle to one another????
    Again, these can all be answered quite easily if you just review the steps of mitosis and meiosis and what happens in each.

    3) What are 3 sources of genetic variation in sexual organisms?
    Here are some hints: one source has the potential to happen every time a cell replicates; one source occurs during the process of meiosis; the final source process occurs in the formation of an embryo.


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  4. #3  
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    a) What type of cells undergo each process?
    - Mitosis = skin, bone, blood (A sexual)
    - Meiosis = testes, ovaries (sexual)

    b) Division of one parent cell results in how many daugher cells?
    - Mitosis = 2
    - Meiosis = ??????
    The answer is based on "Terminal meiosis" whenever meiosis is said (As per the question, was asked for humans.)
    Mitosis= Somatic cells (Actually all cells undergo mitosis but technically the secondary division in "Germinal epithelum cells" is coined as "Secondary meiosis".)
    Meiosis= Germinal epithelial cells of gonads (Simple cuboidal)
    REMEMBER FRIEND "Cells in organs such as the heart do not divide in the adult, except in cases where disease or trauma causes damage. Cells in the nervous system and the brain do not divide after birth, which is why an injury to the spine is usually irreversible though they do perfrom some growth specially in length."
    (b)=Mitosis---2, Meiosis=4
    (c)46 (d)=23 chromosomes.
    (e) Homologous chromosomes are a pair of chromosomes containing the same linear gene sequences, each derived from one parent. They have the same genes, in the same location, but the genes have different versions, (don't get confused with sister chromatids that are exact replicas) alternatively, non-identical chromosomes that contain information for the same biological features and contain the same genes at the same loci but possibly different genetic information, called alleles, at those genes. For example, two chromosomes may have genes encoding eye color, but one may code for brown eyes, the other for blue..
    Though I don't think I've thoroughly answered you, sorry for that, but I think it might help you.[/quote]
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