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    Hopefully it will be no more than 60 for an A like jan 11. As I need 140 UMS in this.
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    how many UMS marks will 50 raw marks equal to providing an A will be around 60-65?
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    (Original post by whc23)
    These are my own answers based on the revision I have done with my daughter and my general knowledge of Biology (I am a University Lecturer).
    A lot of respect for this
    Do you have any idea about grade boundaries?
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    Is genome sequencing the same as DNA sequencing?
    Is selection pressure the same as natural selection?
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    (Original post by entertheOJI)
    Is genome sequencing the same as DNA sequencing?
    Is selection pressure the same as natural selection?
    I would imagine that genome sequencing or DNA sequencing will be equally acceptable for a mark.

    I do not think that selection pressure and natural selection are equivalent. One brings about the other. Selection pressure (eg environmental pressure on a trait) brings about the natural selection of better adapted organisms.
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    That unoffical mark scheme has cheered me up immensely!
    I count about 57... so B?

    its only a small thing compared to my maths fail today which means the result of this doesnt matter anyway for my uni chances as it is now completely impossible but one less resit next year I guess
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    (Original post by Dunn0)
    A lot of respect for this
    Do you have any idea about grade boundaries?
    Sorry, no idea what the grade boundaries might be. I suspect that OCR will set the boundaries once they have marked the papers and have looked at the distribution. They probably do not yet know the grade boundaries themselves.
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    (Original post by whc23)
    I would imagine that genome sequencing or DNA sequencing will be equally acceptable for a mark.

    I do not think that selection pressure and natural selection are equivalent. One brings about the other. Selection pressure (eg environmental pressure on a trait) brings about the natural selection of better adapted organisms.
    what about DNA probe?
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    (Original post by entertheOJI)
    Is genome sequencing the same as DNA sequencing?
    Is selection pressure the same as natural selection?
    no selection pressure is what leads to a natural selection
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    (Original post by Popey93)
    That unoffical mark scheme has cheered me up immensely!
    I count about 57... so B?

    its only a small thing compared to my maths fail today which means the result of this doesnt matter anyway for my uni chances as it is now completely impossible but one less resit next year I guess
    That's good! I got 50 after looking at the mark scheme Good luck for next yeaR
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    (Original post by TobeTheHero)
    That's good! I got 50 after looking at the mark scheme Good luck for next yeaR

    Good luck for you too!
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    (Original post by TobeTheHero)
    what about DNA probe?
    I assume you are thinking about the answer to Q3(a)(i). Difficult to predict what OCR will accept but I would think that DNA probe may not be acceptable. DNA probes can be used to identify a specific gene or related genes in other species but would not give enough information to show that all the Elm trees are from a clone. To show that they are genetically identical I think you need DNA sequence information.
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    (Original post by Nbear)
    what do you think the grade boundaries might be?

    around 65 for an A?

    because the way I see it, this paper probably gives an advantage to those biologists who also do geography and / psychology, which could bring up the grade boundaries

    yes cos one of my friends said it was an easy paper and she does geography as well arghhhh
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    (Original post by whc23)
    I would imagine that genome sequencing or DNA sequencing will be equally acceptable for a mark.

    I do not think that selection pressure and natural selection are equivalent. One brings about the other. Selection pressure (eg environmental pressure on a trait) brings about the natural selection of better adapted organisms.
    Instead of DNA sequencing i Automated sequencing, is it still correct?
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    (Original post by Dunn0)
    Instead of DNA sequencing i Automated sequencing, is it still correct?
    I would give you the mark but you know how fussy OCR can be! The book refers to "automated DNA sequencing" so not sure whether they will accept without telling them what you are sequencing.
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    What about Electrophoresis?
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    (Original post by Waqar Y)
    What about Electrophoresis?
    Electrophoresis is used to separate DNA fragments according to size. It does not give enough information to show that all Elm trees are genetically identical (ie clones). If you said sequencing electrophoresis (the way sequencing used to be done before automated DNA sequencing) you might get the mark.
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    (Original post by whc23)
    Electrophoresis is used to separate DNA fragments according to size. It does not give enough information to show that all Elm trees are genetically identical (ie clones). If you said sequencing electrophoresis (the way sequencing used to be done before automated DNA sequencing) you might get the mark.
    But if you were able to get DNA fragments and seperate them by size - you could view the band patterns to determine if they were clones or not - because the DNA would have similar bands when placed under a nylon sheet, etcetc.
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    (Original post by Waqar Y)
    But if you were able to get DNA fragments and seperate them by size - you could view the band patterns to determine if they were clones or not - because the DNA would have similar bands when placed under a nylon sheet, etcetc.
    I agree that you might get the same banding pattern after digestion with a restriction enzyme. This would tell you that the two samples you were comparing had the same sequence only where the restriction enzymes cut. There would be lots of sequence where you could not be certain it was identical. The only way to know that the DNA is identical over the whole length is by sequencing.
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    anyone got the exam past paper??
 
 
 
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