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Thread: Forensics & Idential twins

  1. #1 Forensics & Idential twins 
    Forum Ph.D.
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    Friend suggested this one.

    Lets say a sample of blood was found at a crime scene, if it belongd to one of a set of identical twins would there be any way you distinguish which twin the blood belonged to (in the lab)?

    I suggested that maybe as the twins may have suffered from different diseases they would have different antibodies but thats a bit overcomplicated in a lab sense...

    Any ideas or is it impossible!


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  3. #2  
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    I don't think you could from a sample of blood, If they were truly identical twins, they'd probably both be evil, so convict the pair of them!


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  4. #3  
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    Yeah thought that bout the blood (and didnt want to say bout the evil thing!)
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  5. #4 Re: Forensics & Idential twins 
    Forum Professor leohopkins's Avatar
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    Quote Originally Posted by Robbie
    Friend suggested this one.

    Lets say a sample of blood was found at a crime scene, if it belongd to one of a set of identical twins would there be any way you distinguish which twin the blood belonged to (in the lab)?

    I suggested that maybe as the twins may have suffered from different diseases they would have different antibodies but thats a bit overcomplicated in a lab sense...

    Any ideas or is it impossible!
    There ARE differences within the DNA, even in identical twins !!
    The hand of time rested on the half-hour mark, and all along that old front line of the English there came a whistling and a crying. The men of the first wave climbed up the parapets, in tumult, darkness, and the presence of death, and having done with all pleasant things, advanced across No Man's Land to begin the Battle of the Somme. - Poet John Masefield.

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  6. #5  
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    What? Differences in expression?
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  7. #6  
    Forum Professor leohopkins's Avatar
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    Quote Originally Posted by Robbie
    What? Differences in expression?
    Differences in code sequence.
    The hand of time rested on the half-hour mark, and all along that old front line of the English there came a whistling and a crying. The men of the first wave climbed up the parapets, in tumult, darkness, and the presence of death, and having done with all pleasant things, advanced across No Man's Land to begin the Battle of the Somme. - Poet John Masefield.

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  8. #7  
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    No it would have to be the same, if they're identical they're both from the same zygote.
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  9. #8  
    Moderator Moderator AlexP's Avatar
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    Quote Originally Posted by leohopkins
    Quote Originally Posted by Robbie
    What? Differences in expression?
    Differences in code sequence.
    would they have RFLPs? (restriction fragment length polymorphisms, if you didn't know...) i don't know whether they happen before or after development... or i could be way off here, maybe this doesn't even make sense...
    "There is a kind of lazy pleasure in useless and out-of-the-way erudition." -Jorge Luis Borges
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  10. #9  
    Forum Freshman Keith's Avatar
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    While identical twins have the same genotype, they can vary greatly in their phenotype. By finding out differences in their nutritional habits and health, the person could be determined. Platelet count or something like that could be used to distinguish the twins.
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  11. #10  
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    Quote Originally Posted by Keith
    While identical twins have the same genotype, they can vary greatly in their phenotype. By finding out differences in their nutritional habits and health, the person could be determined. Platelet count or something like that could be used to distinguish the twins.
    I mostly agree, the phenotype allows [for example] the parents of IT's to tell them apart, I managed to find this which should clear things up a bit...

    I just typed "Forensic Science Identical twins" into google... easy eh?

    http://forensic-evidence.com/site/ID/ID_Twins.html
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  12. #11  
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    Yeah the nutritional idea is interesting alright, it sort of goes back to my antibody idea; basing the result n the person's history.

    Megabrain, I looked at the article but it doesnt really say how one can be distinguishes from the there by blood alone! There must not be one way of finding out except for these random mutations mentioned.

    RFLPs, I'm supposed to know what they are! Ill get back to you when I read up on it properly!
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  13. #12  
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    Quote Originally Posted by Robbie
    Megabrain, I looked at the article but it doesnt really say how one can be distinguishes from the there by blood alone! There must not be one way of finding out except for these random mutations mentioned.
    You should have read what was not there.... ie since the article is about identifying one twin, and there is no mention of blood, then clearly it is not thought practicably possible from blood alone! 8)
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