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AQA A2 Biol4 January 2012 pre- exam discussion

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    (Original post by sanaindaclub)
    **** that funagoo question. Spent 10 minutes going:confused:
    Exactly :|
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    (Original post by sanaindaclub)
    **** that funagoo question. Spent 10 minutes going:confused:
    Any chance of uploading the material on here or pm'ing it ? thanks!
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    Did the Jan '11 paper today as a mock. Didn't do very well I think.
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    might do some work for this tonight.....got a mock tomorrow :yawn:
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    Can anyone find the 2011 June paper?!
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    (Original post by beckswilkinson)
    Can anyone find the 2011 June paper?!
    I think only teachers can access that. Someone could have it though.
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    I took both my Unit 1 & 2 exams in June due to illness and I just completely failed on both of them. On every other exam I took in June I got an A and I have had a look at my paper and the mark scheme and my exam technique is just not at all what they're asking for. Has anyone else overcome problems with their exam techniques? I don't want to do the past papers too many times because once you've done a paper one and gone through the mark scheme any future attempts are obviously not going to be accurate of your knowledge.
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    (Original post by EffKayy)
    http://store.aqa.org.uk/qual/gce/pdf...4-W-SQP-07.PDF
    Can someone help me with 6? Why is the percentage of the black lady birds 51%? I did it and got 42%
    I got the red lady birds answer right though.

    I assumed the black lady birds had heterozygous alleles, etc... so I did 0.7*0.3(*2)
    The 2 equations you need to know are :

    1. p + q = 1

    2. p^2 + q^2 + 2pq = 1

    p or B (dominant allele frequency ) = 1 - 0.7 = 0.3 (rearranged equation p + q = 1)
    q or b (recessive allele frequency) = 0.7 this is give in the data
    p^2 or B^2 (homozygous dominant Black) = 0.3^2 = 0.09
    q^2 or b^2 (homozygous recessive Red) = 0.7^2 = 0.49
    2pq or 2Bb (heterozygous, it is 2pq because you can have pq or qp Black) = 2 x 0.3 x 0.7 = 0.42

    Just to check everything is right

    Substitute numbers into equations:

    1. 0.3 + 0.7 = 1

    2. 0.09 + 0.49 + 0.42 = 1

    Black ladybirds can have genotype B^2 or 2Bb (because B is the dominant allele) which 0.09 and 0.42 = 0.51

    Red ladybirds can only have genotype bb as they have to be homozygous recessive which is 0.49

    Then you just times it by a 100 to go from decimals to percentages

    So 0.51 x 100 = 51% black ladybirds.
    and 0.49 x 100 = 49% red ladybirds.
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    (Original post by Apa)
    I took both my Unit 1 & 2 exams in June due to illness and I just completely failed on both of them. On every other exam I took in June I got an A and I have had a look at my paper and the mark scheme and my exam technique is just not at all what they're asking for. Has anyone else overcome problems with their exam techniques? I don't want to do the past papers too many times because once you've done a paper one and gone through the mark scheme any future attempts are obviously not going to be accurate of your knowledge.
    Yeah the AQA biology has a very awkward mark scheme, I suppose we just have to practice, I did the June 2011 exam paper as a mock and got 46/75 which is terrible because of poor exam technique, it is so annoying as you know the answer but because you haven't phrased the answer in the way they like you don't get the mark.
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    (Original post by Besakt)
    Yeah the AQA biology has a very awkward mark scheme, I suppose we just have to practice, I did the June 2011 exam paper as a mock and got 46/75 which is terrible because of poor exam technique, it is so annoying as you know the answer but because you haven't phrased the answer in the way they like you don't get the mark.
    Exactly! It's so frustrating. I've had rejections from Leicester AND Sheffield because their mark scheme is just so rubbish I can't get the one particular word/phrase their looking for when I I know the content so well I could teach the entire class the syllabus from memory and everything would be 100% clear and correct, but no. The annoying thing is my college swapped from OCR to AQA the year I was supposed to start A Levels and the only reason I have to now do AQA is because I had to leave because of illness

    I hate AQA.
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    It's true that AQA questions tend to be vague and not direct to the point of what they're actually asking for. Just make sure you state the obvious - this is one thing that a lot of people don't do.
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    (Original post by Apa)
    Exactly! It's so frustrating. I've had rejections from Leicester AND Sheffield because their mark scheme is just so rubbish I can't get the one particular word/phrase their looking for when I I know the content so well I could teach the entire class the syllabus from memory and everything would be 100% clear and correct, but no. The annoying thing is my college swapped from OCR to AQA the year I was supposed to start A Levels and the only reason I have to now do AQA is because I had to leave because of illness

    I hate AQA.
    One of the questions in the June 2011 paper I answered word for word from the textbook which I've now pretty much memorised and still got it wrong. Don't even get me started on "how science work" questions.
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    (Original post by NutterFrutter)
    It's true that AQA questions tend to be vague and not direct to the point of what they're actually asking for. Just make sure you state the obvious - this is one thing that a lot of people don't do.
    The questions they ask are so vague yet the answers they want are so specific. :confused:
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    (Original post by Besakt)
    The questions they ask are so vague yet the answers they want are so specific. :confused:
    It's AQA, it's to be expected. I hate the HSW questions. :yep:
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    (Original post by Besakt)
    One of the questions in the June 2011 paper I answered word for word from the textbook which I've now pretty much memorised and still got it wrong. Don't even get me started on "how science work" questions.
    Do you have the June 2011 paper on your computer?
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    (Original post by NutterFrutter)
    Do you have the June 2011 paper on your computer?
    No but I will probably have the paper copy on monday. Why?
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    (Original post by Besakt)
    No but I will probably have the paper copy on monday. Why?
    Was wondering if you could upload it. Doesn't matter.
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    (Original post by NutterFrutter)
    Was wondering if you could upload it. Doesn't matter.
    :lol: Got a mock exam coming up?
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    (Original post by Besakt)
    :lol: Got a mock exam coming up?
    Not until after the Christmas break.
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    (Original post by NutterFrutter)
    Not until after the Christmas break.
    I wouldn't want to rob you of the satisfaction of revising awkward AQA biology mark schemes.

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Updated: January 12, 2013
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