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Thread: Platypus vs zebrafish DNA

  1. #1 Platypus vs zebrafish DNA 
    Forum Sophomore laza's Avatar
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    I just read that we share more genes with zebrafish then we do with platypus, how is that possible ? How can we share more DNA with a fish then with a mammal ( i know they are monotremes but still ).


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  3. #2  
    Forum Professor Zwolver's Avatar
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    It's also not true. We share more DNA with platypus than with a zebrafish. I can tell you that simply by logic.

    You might have heard that zebrafish were used as a protein template for humans, and they respond even more similar to stimulae than even some mammals like platypus.

    What is your source? I have looked for evidence to oppose your claim but didn't find any soon, so anyone?


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  4. #3  
    Forum Sophomore laza's Avatar
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    I really cant find it now, it was like an interactive quiz on Nat Geographic's website, where you need to place animals closest to us in order, and zebrafish came before the platypus, i was also thinking that they made a mistake.
    "There is grandeur in this view of life,from so simple beginning endless forms most beautiful and most wonderful have been, and are being, evolved.
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    Forum Professor Zwolver's Avatar
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    Ah, don't trust either national geographic, or discovery on anything else than entertainment. They are not required to produce truth, they are only providing entertainment. Wikipedia has a better track record than NG or Disc. Actually, wikipedia is great. Better track record than the average published research paper from Letters from nature or blood, or elsevier.

    The platypus is the weirdest mammal though.. They are probably farthest from us. Even though they look like ducks, they are not closer related to them, than to us. Interesting though.
    Growing up, i marveled at star-trek's science, and ignored the perfect society. Now, i try to ignore their science, and marvel at the society.

    Imagine, being able to create matter out of thin air, and not coming up with using drones for boarding hostile ships. Or using drones to defend your own ship. Heck, using drones to block energy attacks, counterattack or for surveillance. Unless, of course, they are nano-machines in your blood, which is a billion times more complex..
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  6. #5  
    Forum Cosmic Wizard
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    Comparative Genomics is something I know nothing about.

    Apparently it is a statistical treatment of how similar genomes are.
    You might be able to find an answer for your question if you search with "comparative genomics" included as key words.
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  7. #6  
    exchemist
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    Quote Originally Posted by laza View Post
    I really cant find it now, it was like an interactive quiz on Nat Geographic's website, where you need to place animals closest to us in order, and zebrafish came before the platypus, i was also thinking that they made a mistake.
    I've found this: Family ties: Relationship between human and zebrafish genomes - Wellcome Trust Sanger Institute

    which explains why the zebrafish is proposed as a good research tool. Seems to be do with low number of pseudogenes, compared to human DNA. But the similarity is only 70%, which does not seem high, considering I read somewhere that a banana has 40% similarity.

    This article: Platypus genome explains animal's peculiar features; holds clues to evolution of mammals | Newsroom | Washington University in St. Louis

    says the platypus shares 82% of its genes with human, mouse, dog, opossum and chicken. I couldn't find a straight comparison with human DNA, however.
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  8. #7  
    Forum Professor Zwirko's Avatar
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    Quote Originally Posted by laza View Post
    I just read that we share more genes with zebrafish then we do with platypus, how is that possible ? How can we share more DNA with a fish then with a mammal ( i know they are monotremes but still ).
    Sharing more genes doesn't necessarily mean that two organisms are more closely related. It's possible for different lineages to undergo different patterns of gene loss and gene family expansion, both of which can alter the number of shared genes. Sharing genes doesn't really say much about how similar those genes are either. If we looked at their genomes as a whole, using better methods, it'd reveal that we are more closely related to the platypus than the zebrafish. Humans and zebrafish diverged about 400 mya; humans and platypus, about 170 mya.


    I've no idea about the specifics of this particular claim however.
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