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    (Original post by Sal296)
    Alright thanks! I reallly hope this paper would be easier that the unit 1.
    I don't think Unit 1 was actually HARD. Just very unpredictable... But yeah I'm with you
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    Does anyone got the predicted grade bouderies, hope they're not high!

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    (Original post by AvWOW)
    I don't think Unit 1 was actually HARD. Just very unpredictable... But yeah I'm with you
    I was so pissed off with that graph :P
    Anyways, hopefully this is gonna be good.
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    (Original post by Sal296)
    I was so pissed off with that graph :P
    Anyways, hopefully this is gonna be good.
    haha Ikr? yeahhh... Good luck
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    (Original post by AvWOW)
    haha Ikr? yeahhh... Good luck
    GLUCK
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    unit 1 wasn't that hard but too lengthy! and the question structures were kinda weird plus they tried something new this time (that 3-D graph)
    I get the feeling the unit 2 gonna be the same and yeah some new things definitely popping up, that weren't before!
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    (Original post by Amir52)
    unit 1 wasn't that hard but too lengthy! and the question structures were kinda weird plus they tried something new this time (that 3-D graph)
    I get the feeling the unit 2 gonna be the same and yeah some new things definitely popping up, that weren't before!
    Hope not

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    (Original post by PlayerBB)
    Hope not

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    sorry if I've scared you! even I don't support my thinking capabilities at times!!
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    (Original post by Amir52)
    sorry if I've scared you! even I don't support my thinking capabilities at times!!
    No it's okay hahah, it's good you said that so we can be totatly prepared!

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    so how many papers have u all done?
    I did june 11-to june 14, and jan 12 and 13... will also do 14
    ive noticed things repeat.. and for our unit 2, maybe the first chap will be asked more than the second one...
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    Does anyone know where the unofficial mark schemes are posted?? And is updated??
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    (Original post by A84)
    so how many papers have u all done?
    I did june 11-to june 14, and jan 12 and 13... will also do 14
    ive noticed things repeat.. and for our unit 2, maybe the first chap will be asked more than the second one...
    I did from jan 2009 to june 14 and will do jan 15 tomorrow... Yeah a lot of the things have popped up countless times soI've decided I'll memorise the mark scheme points for these questions lol
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    cool u did all of em.. I didn't have much time to do so.... Good luck
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    Right can I just say WHAT WAS THAT UNIT 1 PAPER guys I honestly thought it was the worst exam ever hahaha. How are you guys preparing yourselves for Monday? Past papers?
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    (Original post by PlayerBB)
    The totipotent cell will divide and differentiate into a pluripotent cell by activated genes which produce mRNA which will be translated into specific proteins that will modify the cell and differentiate it then the pluripotent cell will differentiate into a multipotent cell

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    Thank you so much , that seems right but doesn't cell differentiation produce a specialised cell eg red blood cell as all genes are switched off in a specialised cell? I think multipotent cells still have a active genes ?
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    Hi can someone explain to me how natural selection takes place?
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    (Original post by aisha17)
    Hi can someone explain to me how natural selection takes place?
    I'll try, from the top off my head...

    (There are different alleles at one loci of a chromosome coding for the same characteristic within the gene pool of a species (polygenic inheritance)

    SO..
    There is a selection pressure (such as change of climate or increased predators)
    .Only individuals carrying the "advantageous allele"/advantageous characteristics (such as certain behaviour or fur coat for camouflage etc) will survive and breed
    Advantageous allele is passed to their offspring
    The offspring have a better chance of survival until the next selection pressure arrives, they reach adulthood and breed, frequency of advantageous allele increases in the gene pool
    Fairly soon the "disadvantageous allele" will have died out, now all individuals in the species have this new characteristic, they have adapted/evolved
    This can only happen thanks to polygenetic inheritance
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    (Original post by DK 96)
    Thank you so much , that seems right but doesn't cell differentiation produce a specialised cell eg red blood cell as all genes are switched off in a specialised cell? I think multipotent cells still have a active genes ?
    Yeah, initially the totipotent stem, cell have all genes switched on then when the cell divide and form more cells, then the cell determination will cause to have some genes switched off so specific mRNA is produced and translated to a specific protein which control cell process and modify the cell differentiating it to a specific cell as RBC, then this continues to multipotency, then in multipotent cell all genes are switched off so that's why it can't go back to pluripotency

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    (Original post by PinkRhinos)
    I'll try, from the top off my head...

    (There are different alleles at one loci of a chromosome coding for the same characteristic within the gene pool of a species (polygenic inheritance)

    SO..
    There is a selection pressure (such as change of climate or increased predators)
    .Only individuals carrying the "advantageous allele"/advantageous characteristics (such as certain behaviour or fur coat for camouflage etc) will survive and breed
    Advantageous allele is passed to their offspring
    The offspring have a better chance of survival until the next selection pressure arrives, they reach adulthood and breed, frequency of advantageous allele increases in the gene pool
    Fairly soon the "disadvantageous allele" will have died out, now all individuals in the species have this new characteristic, they have adapted/evolved
    This can only happen thanks to polygenetic inheritance
    Thank you so much Could you also help me with the core practical about totipotency and tissue culture?
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    true unit 1 was weird... lets pray unit 2 aint weirder.
 
 
 
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