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Thread: chromosome #

  1. #1 chromosome # 
    Moderator Moderator AlexP's Avatar
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    Is there any direct correlation between chromosome number and the size of an organism? The only examples I know of are 8 chromosomes in Drosophila melanogaster (fruit fly) and of course 46 in humans, so it appears there is a correlation for those two examples. But does it remain true for other organisms?


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    Forum Freshman Keith's Avatar
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    Idk, but if I remember from bio, elephants have 56.

    And oh, bacteria only have like part of a gene, they don't even have a whole chromosome I don't think.


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    Moderator Moderator AlexP's Avatar
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    Quote Originally Posted by Keith
    Idk, but if I remember from bio, elephants have 56.

    And oh, bacteria only have like part of a gene, they don't even have a whole chromosome I don't think.
    ok, so if you're remembering correctly, then that would fit the bigger size-more chromosomes idea. Bacteria have just one chromsome, but its not a chromosome in the typical sense, because it's a circular one, and it's lacking various proteins that more advanced organisms have associated with their chromosomes, so bacteria have rather primitive DNA in that sense.
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    Forum Freshman Keith's Avatar
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    I was just looking up some chromosome numbers for whales, and the theory doesn't look good.

    the Blue Whale (Balaenoptera musculus) has 22 pairs,
    whereas the sperm whale (Physeter macrocephalus) has 21 pairs.
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    The largest chromosome number discovered so far is 1260 chromosomes and is found in the very complex very sophisticated... fern plant! This is because it is a very old species and has accumulated a huge amount of junk DNA over the ages, keep in mind that quantity of DNA, not function is the main factor. It s fair to say catagorically no to your answer, there are all sorts of different numbers for various organisms.
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    Moderator Moderator AlexP's Avatar
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    Quote Originally Posted by The Matt
    http://morgan.rutgers.edu/morganwebframes/level1/page2/ChromNum.html
    compare for yourself!
    i've never been able to find a list like that before, thanks.

    Quote Originally Posted by Robbie
    The largest chromosome number discovered so far is 1260 chromosomes
    interesting.
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    C-value paradox ... there is correlation between genome size and evolutionary complexity.
    It is not so much that I have confidence in scientists being right, but that I have so much in nonscientists being wrong. --- Isaac Asimov
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