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** LC BIOLOGY 2014 - Before and after discussion **

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13567…16

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    #62
    AulBiddy
    Registered Users Posts: 348 ✭✭AulBiddy


    KellyR18 wrote: »
    Could someone please give me some advice/tips on how to do do genetic crosses? I really have no clue! Please! :)

    you'll fly them once you get the hang of them :)

    I'll try do an easy example

    Take for instance 2 cats come together to make offspring. One carries the genotype BB and the other type is Bb. BB is a black coat (the dominant coat), Bb is also black dominant (as it still has a dominant gene in its make up) and bb is white (it is the recessive gene.)
    BB = dominant (black)
    Bb = dominant (black)
    bb = recessive (white)

    Cat with the genotype BB can only produce the dominant gene, B. He cannot produce b, the recessive gene, as he does not carry it.

    Cat with the genotype Bb can produce one of two genes: B or b. She can produce either one as she carries them both.

    So put them into a punnet square
    1e57dj.jpg

    and fill them in
    2u7n6n4.jpg

    You have found the genotype of their possible offspring
    Finding the phenotype is easy so use the key (BB, Bb, bb)
    BB = black coat
    Bb = black coat

    If this is too complicated let me know what you don't understand and i might try help :D


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    #63
    oncex
    Closed Accounts Posts: 505 ✭✭✭oncex


    What's the control for enzyme immbolisation?

    Also does anyone know if we need to learn the ratios for genetic crosses? As in would try help identify which type of cross to do?


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    #64
    Poliana.xo
    Registered Users Posts: 300 ✭✭Poliana.xo


    oncex wrote: »
    What's the control for enzyme immbolisation?

    There is none for the actual immobilisation, but for testing application it's free yeast


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    #65
    Feelinlazy
    Registered Users Posts: 4 ✭Feelinlazy


    I'm actually scared for tomorrow >.< Biology is my worst subject.


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    #66
    KellyR18
    Registered Users Posts: 50 ✭✭KellyR18


    AulBiddy wrote: »
    you'll fly them once you get the hang of them :)

    I'll try do an easy example

    Take for instance 2 cats come together to make offspring. One carries the genotype BB and the other type is Bb. BB is a black coat (the dominant coat), Bb is also black dominant (as it still has a dominant gene in its make up) and bb is white (it is the recessive gene.)
    BB = dominant (black)
    Bb = dominant (black)
    bb = recessive (white)

    Cat with the genotype BB can only produce the dominant gene, B. He cannot produce b, the recessive gene, as he does not carry it.

    Cat with the genotype Bb can produce one of two genes: B or b. She can produce either one as she carries them both.

    Thanks, I understand that, it's just when they mention homozygous and heterozygous I had no idea which size punnet square to use! Thank you so much!! :D


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    #67
    marno21
    Moderators, Entertainment Moderators, Science, Health & Environment Moderators Posts: 14,362 Mod ✭✭✭✭marno21


    oncex wrote: »
    What's the control for enzyme immbolisation?

    Also does anyone know if we need to learn the ratios for genetic crosses? As in would try help identify which type of cross to do?
    Jelly tots. :)


    (On a more serious note, glass beads)


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    #68
    PaleMoonlight
    Registered Users Posts: 54 ✭✭PaleMoonlight


    Is spelling a big deal in biology? For example I always spell glycolysis a bit wrong, its usually only a letter or two mixed up. Will they still accept it as correct if its close enough?


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    #69
    TooMuchStudy
    Registered Users Posts: 82 ✭✭TooMuchStudy


    PaleMoonlight wrote: »
    Is spelling a big deal in biology? For example I always spell glycolysis a bit wrong, its usually only a letter or two mixed up. Will they still accept it as correct if its close enough?

    I doubt they'll dock you marks for spelling it wrong. If they can make it out, you'll get the marks


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    #70
    peanut.lover22
    Registered Users Posts: 22 ✭peanut.lover22


    Be careful with spelling as they are many words which are spelt nearly the exact same bar one or two letters. It could cost you marks and be the difference in a grade.


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    #71
    Jones82
    Registered Users Posts: 28 ✭Jones82


    Jesus lads is there anything worse than looking at these experiments....


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    #72
    brijay
    Registered Users Posts: 227 ✭✭brijay


    Which Exps are likely to come up ? Cant study them all at this stage


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    #73
    Jones82
    Registered Users Posts: 28 ✭Jones82


    brijay wrote: »
    Which Exps are likely to come up ? Cant study them all at this stage

    IAA, immobilize enzyme, heart, isolation of DNA, TS of a dicot stem, leaf yeast growth.. Basically filth..


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    #74
    Feelinlazy
    Registered Users Posts: 4 ✭Feelinlazy


    Does anyone know for the Base Pares in DNA if its Adrenine or Adenine? because in my notes its Adenine but in the revise vise its Adrenine? ...


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    #75
    A7XGirl
    Registered Users Posts: 306 ✭✭A7XGirl


    Feelinlazy wrote: »
    Does anyone know for the Base Pares in DNA if its Adrenine or Adenine? because in my notes its Adenine but in the revise vise its Adrenine? ...
    It's adenine in the book


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    #76
    Hollister11
    Closed Accounts Posts: 5,482 ✭✭✭Hollister11


    Is anyone else feeling very calm about Biology tomorrow ?
    I have struggled since i started in 5th year, but it has all started to click since i finished up school...


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    #77
    Badwulf
    Registered Users Posts: 411 ✭✭Badwulf


    So do you guys think the paper will be easier than previous years tommrow or harder ?


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    #78
    BauBau19
    Registered Users Posts: 73 ✭✭BauBau19


    Hollister11 wrote: »
    Is anyone else feeling very calm about Biology tomorrow ?
    I have struggled since i started in 5th year, but it has all started to click since i finished up school...

    I was up until now...spent all afternoon in the hospital and didn't get a chance to revise anything..Will have a look over experiments in the morning.

    Somehow, I have every single question in the exam papers done, and I still don't know half the course. :(


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    #79
    allyb17
    Registered Users Posts: 59 ✭✭allyb17


    Ok so what experiments are most likely?
    IAA
    Heart
    Isolating DNA
    Enzyme immobilisation
    Is there more that could? Any predictions, f**** hate unit 1 and experiments, also do you HAVE to do ecology?


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    #80
    bb1234567
    Registered Users Posts: 5,496 ✭✭✭bb1234567


    Ugh why does biology have to be on same day as irish WHYYY


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    #81
    Lollipop95
    Registered Users Posts: 1,269 ✭✭✭Lollipop95


    Feelinlazy wrote: »
    I'm actually scared for tomorrow >.< Biology is my worst subject.

    Are you ordinary or higher? :) I'm ordinary and literally just want a D3 in it. Not counting for points anyways. It it also my worst subject apart from maths! Can't describe my hatred for it :p


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    #82
    bb1234567
    Registered Users Posts: 5,496 ✭✭✭bb1234567


    Lollipop95 wrote: »
    Are you ordinary or higher? :) I'm ordinary and literally just want a D3 in it. Not counting for points anyways. It it also my worst subject apart from maths! Can't describe my hatred for it :p

    I love Biology apart from anything DNA/genetics related...So hard :pac: Im avoiding any of that stuff, well as much as I can atleast


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    #83
    A7XGirl
    Registered Users Posts: 306 ✭✭A7XGirl


    Does anyone know the purpose of an acetate grid?


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    #84
    bb1234567
    Registered Users Posts: 5,496 ✭✭✭bb1234567


    A7XGirl wrote: »
    Does anyone know the purpose of an acetate grid?

    Measuring seed root lenth


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    #85
    Lollipop95
    Registered Users Posts: 1,269 ✭✭✭Lollipop95


    bb1234567 wrote: »
    I love Biology apart from anything DNA/genetics related...So hard :pac: Im avoiding any of that stuff, well as much as I can atleast
    So lucky! I'd love to be good at biology, I think it's the fact it's so much learning and laziness is unfortunately a major trait of mine :p I actually don't mind ecology or photosynthesis. Bacteria isn't too bad either. And I really like the food experiments and the food chapter so I suppose I don't hate it that much :p but I might this time tomorrow :p I won't' be touching genetics, will do ecology instead :)
    Would you really need 3 hours for ordinary level? :eek: as I know higher level need to go into a lot more detail. A friend of mine is actually moving up from ordinary to higher. She did higher until mocks and then moved down but she's moving up tomorrow for points!


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    #86
    Feelinlazy
    Registered Users Posts: 4 ✭Feelinlazy


    Lollipop95 wrote: »
    Are you ordinary or higher? :) I'm ordinary and literally just want a D3 in it. Not counting for points anyways. It it also my worst subject apart from maths! Can't describe my hatred for it :p

    Higher. I'm considering dropping it tomorrow but I don't really want to because I need the points T.T, I'm gonna see how I am prepared for tomorrow if i feel like I can't do it imma drop it, I just want a goddamn D1 and I will be over the moon :3


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    #87
    Badwulf
    Registered Users Posts: 411 ✭✭Badwulf


    Does everyone really think bio is that hard? I manged to cover unit 1 2 and about 4 chapters from unit 3 AND all experiments in about 2 weeks, it also helps that the questions repeat themselves.

    ALOT


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    #88
    Caoimhz
    Registered Users Posts: 7 ✭Caoimhz


    Anyone know the colour change in the idioform test in the production of alcohol using yeast exp? Am I right in saying its warm orange to green? :)


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    #89
    EoghanIRL
    Registered Users Posts: 4,080 ✭✭✭EoghanIRL


    Caoimhz wrote: »
    Anyone know the colour change in the idioform test in the production of alcohol using yeast exp? Am I right in saying its warm orange to green? :)

    Biuret test : blue to purple


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    #90
    Caoimhz
    Registered Users Posts: 7 ✭Caoimhz


    EoghanIRL wrote: »
    Biuret test : blue to purple

    So will I just forget the idioform test or is the biuret test the same thing? The amout of confusion this experiment has caused in my life....


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    #91
    EoghanIRL
    Registered Users Posts: 4,080 ✭✭✭EoghanIRL


    Caoimhz wrote: »
    So will I just forget the idioform test or is the biuret test the same thing? The amout of confusion this experiment has caused in my life....
    Hey:) either is fine .
    Iodoform test : pale yellow crystals are formed confirming presence of alcohol .


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