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    (Original post by diggy)
    Does anybody have the markscheme for January 2013

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    6BI02_01_rms_20130307.pdf
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    (Original post by Daniel Atieh)
    The Assassin
    ok B has greater species richness but which area is more biodiverse?
    Attachment 221120
    A.
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    the plant parnt is so boring, I hate it.btw stem cells is my favourite
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    this unit is so long, and boring

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    So happy the specimen papers are one of the hardest, managed to scrape 71% on it, so I just need to do that on Monday.
    Although some of those questions are batcrazy
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    (Original post by mynameisntbobk)
    So happy the specimin papers are one of the hardest, managed to scrape 71% on it, so I just need to do that on Monday.
    Although some of those questions are batcrazy
    Smashed it well done, good luck on Monday. you'll be fine
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    (Original post by yarshad)
    Smashed it well done, good luck on Monday. you'll be fine
    Thank you and good luck to you! Hopefully we all come out of it smiling
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    Could someone give me a detailed explanation on crossing over and independant assortment please? I cant get my head around it:P Thankyou!
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    Do we need to know any of these topics:

    Epistasis
    Phases of Meiosis
    Collenchyma, Sclerenchyma and Parenchyma
    Plasmodesmata
    Apoplast and symplast pathway and casaprian strip
    Cereals & grains and Cotton & linen
    Isolation mechanisms

    Thanks a lot

    Also, what's the difference between micropropagation and tissue culture?
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    (Original post by JaayBiology)
    Could someone give me a detailed explanation on crossing over and independant assortment please? I cant get my head around it:P Thankyou!
    Crossing over and independent assortment are two processes which greatly increases the genetic variety in gametes formed by meiosis.

    Crossing over: Happens during meiosis 1. basically large enzymes cut off bits of maternal and paternal chromosomes and swap them around. Of course this only happens between homologous pairs of chromosomes, so that they still have the same genes, just different combinations of alleles. The points where the chromosomes break off are called chiasmata.
    This leads to variation in two ways: 1. the exchange of genetic material in itself leads to added genetic variation. 2. errors in this process lead to mutations which introduce new alleles into the gene pool of a particular species.

    Independent assortment: So basically you have TWO sets of chromosomes, 23 from your mom and 23 from your dad (46 in total). Now when meiosis takes place, the gametes formed have only ONE set of chromosomes (23 in total). During meiosis the maternal and paternal chromosomes are distributed into the gametes completely at random. This means that each gamete may contain any number from 0-23 of either your maternal or paternal chromosomes. So no two gametes are identical.

    The independent assortment bit is really difficult to explain, I hope it helped though.
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    (Original post by kevsamuel)
    Do we need to know any of these topics:

    Epistasis
    Phases of Meiosis
    Collenchyma, Sclerenchyma and Parenchyma
    Plasmodesmata
    Apoplast and symplast pathway and casaprian strip
    Cereals & grains and Cotton & linen
    Isolation mechanisms

    Thanks a lot

    Also, what's the difference between micropropagation and tissue culture?
    Need to know Scelernchyma and plasmodesmata.

    lol, no idea about your last question. Don't even know what it is :ahee:
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    (Original post by kevsamuel)
    Do we need to know any of these topics:

    Epistasis NO
    Phases of Meiosis NO
    Collenchyma, Sclerenchyma and Parenchyma NOT COLLENCHYMA AND PARENCHYMA
    Plasmodesmata YES
    Apoplast and symplast pathway and casaprian strip NO
    Cereals & grains and Cotton & linen MAYBE
    Isolation mechanisms NO

    Thanks a lot

    Also, what's the difference between micropropagation and tissue culture? Whats that?
    As per, above.
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    (Original post by mynameisntbobk)
    So happy the specimen papers are one of the hardest, managed to scrape 71% on it, so I just need to do that on Monday.
    Although some of those questions are batcrazy
    well done!! hope u get full marks on monday!
    so u got around 56 in the specimen right?
    the papers i didn't solve yet are jan 013, specimen and jan 2010 (which i just solved) and i got 60...boundary for A was 58...could have got 64 but done really some stupid mistakes:mad:
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    CoolRunner
    is this A or B? Name:  endemic.jpg
Views: 95
Size:  36.9 KB
    and many questions in old papers were aking about meiosis like spermocytes and that stufff....shud i study it ?
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    (Original post by Daniel Atieh)
    CoolRunner
    is this A or B? Name:  endemic.jpg
Views: 95
Size:  36.9 KB
    and many questions in old papers were aking about meiosis like spermocytes and that stufff....shud i study it ?
    For species richness: A

    For biodiversity: B
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    (Original post by CoolRunner)
    For species richness: A

    For biodiversity: B
    u mean species richness is B and biodiversity is A?
    species richness is no of different species in an area so B i guess
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    (Original post by Daniel Atieh)
    CoolRunner
    is this A or B? Name:  endemic.jpg
Views: 95
Size:  36.9 KB
    and many questions in old papers were aking about meiosis like spermocytes and that stufff....shud i study it ?
    what is the question? :/

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    which two domains are more distantly related and why?

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    (Original post by Daniel Atieh)
    u mean species richness is B and biodiversity is A?
    species richness is no of different species in an area so B i guess
    Doh, Yes thats what i meant!
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    (Original post by Rubyturner94)
    what is the question? :/

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    species richness A or B and biodiversity A or B
 
 
 
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