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    (Original post by loperdoper)
    12:3:1/13:3 - dominant epistasis
    9:3:4 - recessive epistasis
    9:7 - complementary epistasis


    You need to know at least one example for succession, so provided you know another one that's fine.
    Thank you!
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    can someone help me on q2a https://84a2c6735211cb85ba2409546df4...%20Biology.pdf
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    Something weird:In the OCR Heinemanne book it says that by responding to external stimuli it helps the plant to 'avoid stress or to avoid being eaten'What? How can it cause help the plant to avoid being eaten?
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    (Original post by tewas)
    Adv: -animals with desirable characteristics can be produced eg high milk yield
    - rare species on the verge on extinction can be preserved
    - genetically engineered organisms can be produced quickly

    Dis: - little genetic variation - more susceptible to environmental conditions/disease
    - nobody knows long term health implications
    - animal welfare issues hardly ever taken into account
    thank you
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    so emotionally drained bc of this exam my body can't take anymore
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    (Original post by Shostakovish)
    Something weird:In the OCR Heinemanne book it says that by responding to external stimuli it helps the plant to 'avoid stress or to avoid being eaten'What? How can it cause help the plant to avoid being eaten?
    Can emit chemicals that smell toxic to put predators off.
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    You have to use your knowledge about Dominant and recessive epistatis,

    for the first bit Its Dominate V so you move down one through the V then its A dominant C so you move another one and then finally a Dominant B, Where you arrive on red which is the phenotype expressed.

    Same thing for the others as well but for the second one you can see that its recessive first so you stop there. there is no other route after that.
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    This is epitasis (I think I spelt that right)
    I think it is this
    1) VvCcBb - so, dominant V, so it has intermediate compound one
    Dominant C - so it has intermediate compound 2
    Dominant B - so it is ultimately red
    2)vvCCBB - no dominant v, so it is vermillion
    3) VvccBB - Dominant V so it has intermediate compound 1
    Recessive (not dominant) c, so it is cinnabar
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    (Original post by Shostakovish)
    Something weird:In the OCR Heinemanne book it says that by responding to external stimuli it helps the plant to 'avoid stress or to avoid being eaten'What? How can it cause help the plant to avoid being eaten?
    Release of chemical's to deter the organism(s) that are trying to place stress or are attempting to eat it.
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    All I know about eutrophication is that it's when sewage water adds additional nutrients, increasing growth rate. Is there anything more I should know?


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    (Original post by Shostakovish)
    Something weird:In the OCR Heinemanne book it says that by responding to external stimuli it helps the plant to 'avoid stress or to avoid being eaten'What? How can it cause help the plant to avoid being eaten?
    curling it's leaves
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    (Original post by Shostakovish)
    This is epitasis (I think I spelt that right)
    I think it is this
    1) VvCcBb - so, dominant V, so it has intermediate compound one
    Dominant C - so it has intermediate compound 2
    Dominant B - so it is ultimately red
    2)vvCCBB - no dominant v, so it is vermillion
    3) VvccBB - Dominant V so it has intermediate compound 1
    Recessive (not dominant) c, so it is cinnabar
    oh okay, thank you !
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    (Original post by domcandrews)
    What are the ratios we should know for genetics?
    The ones for epistatsim, but you can work it out from the punnett square
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    (Original post by loperdoper)
    Can emit chemicals that smell toxic to put predators off.
    Thank you so much!
    May you be granted a life of happiness
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    join this chat...we are discussing stuff and answering questions and ****. it pretty decent
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    (Original post by NatRichmond)
    join this chat...we are discussing stuff and answering questions and ****. it pretty decent
    link pls
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    please can someone help me on question d) on the chi-squared test spread in the OCR Heineman Textbook?
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    Every 1 look at wheat fam
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    Animals learning to relate a pair of events and respond to the first in anticipation of the second - it's passive and involuntary (Just think of the dog food and the bell) :-)
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    (Original post by bakedbeans247)
    This is what i've heard people have been saying and what i think hasn't come up for a while:

    galapagos,
    something out of the topic about pcr/genome sequencing/insulin/rice etc,
    something out of the pages 232, 236-237 (muscles topic),
    brain
    shedding leaves (pg 223)
    how auxins stimulate shoot growth (pg 222)
    meiosis
    apoptosis
    epistasis
    something out of the topic animal behaviors (social behavior in primates i think)
    Chi squared
    Nitrogen cycle
    Aseptic techniques/Asepsis - that table on the bottom of pg 163
    Timber management

    but anything could come up even repeated topics

    Thank you so much! [ran out of rep sorry]
 
 
 
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