Hey there! Sign in to join this conversationNew here? Join for free

AQA Biology B2 - Unofficial Mark Scheme Watch

  • View Poll Results: What do you predict your score?
    < 10%
    3.14%
    > 10%
    0.42%
    > 20%
    1.68%
    > 30%
    3.35%
    > 40%
    4.72%
    > 50%
    6.50%
    > 60%
    14.47%
    > 70%
    23.58%
    > 80%
    28.93%
    > 90%
    10.38%
    100%
    2.83%

    Offline

    1
    ReputationRep:
    Parents Phenotype = Brown hair : Red hair Parents genotype = Bb : Bb Gametes genotype = B - b : B - b Offspring genotypes = BB Bb Bb bb (1 in 4 chance / 3:1 ratio) Offspring genotypes = Brown hair : Brown hair : Brown hair : red hair
    Offline

    1
    ReputationRep:
    (Original post by Blahblahblah7)
    That's what I put I think and I revised it quite well


    Phenotype is whet you see e.g. Brown hair
    Genotype is what's there e.g. Bb
    And for Dad I put XY and mum is XX
    i put this aswell but people are saying its wrong ohwell
    Offline

    0
    ReputationRep:
    The question asking for the estimated number of plants in a field was 160,000 i think as the quadrant was 25cm X 25cm meaning the total area in m2 would be .25*.25*10 to give .635m2 so there are 32 plants per m2 and 32*100*50=160,000
    Offline

    0
    ReputationRep:
    (Original post by Naco88)
    It said that it was an example of the equipment that you can use but if you used all 3 then it will probably get you the marks.
    you also had to talk about how to make the test valid eg by using quadrats, transects etc.
    Offline

    0
    ReputationRep:
    what about the stem cell questions about an advantage and disadvantage to using stem cell from a childs own umbilical cord ??????
    Offline

    2
    ReputationRep:
    Does anyone else think that this was piss hard and that b3 was much better?
    Offline

    10
    ReputationRep:
    (Original post by Macym)
    what about the stem cell questions about an advantage and disadvantage to using stem cell from a childs own umbilical cord ??????
    it is okay because it won't have thical problems, since the cord cant form a whole new organism, but it will be rejected.
    Offline

    10
    ReputationRep:
    (Original post by hansa123)
    you also had to talk about how to make the test valid eg by using quadrats, transects etc.
    no you didn't go away
    Offline

    11
    ReputationRep:
    Plantains question's answer was 1600, all of my class got this. Also an advantage for hydrogen peroxide question is that is does not require a high temperature
    Offline

    1
    ReputationRep:
    For quadrats question:
    0.25m x 0.25m = 0.0625m^2
    0.0625 x 10 = 0.625m^2 (Total area of 10 quadrats)
    20 ÷ 0.625 = 32
    32 x 5000m^2 = 160000 plantains in total
    Is this correct and will it get all the marks?
    Offline

    2
    ReputationRep:
    (Original post by funky2722)
    it is okay because it won't have thical problems, since the cord cant form a whole new organism, but it will be rejected.
    Wasnt the question just: why would using stem cells from the childs umbilical cord not help the childs genetic disorder?
    Offline

    0
    ReputationRep:
    (Original post by Yusuf90)
    For quadrats question:
    0.25m x 0.25m = 0.0625m^2
    0.0625 x 10 = 0.625m^2 (Total area of 10 quadrats)
    20 ÷ 0.625 = 32
    32 x 5000m^2 = 160000 plantains in total
    Is this correct and will it get all the marks?
    Thats what i got and number seems reasonable for such a large area
    Offline

    0
    ReputationRep:
    (Original post by funky2722)
    no you didn't go away
    yes you did just because you didnt doesnt mean you have to be a stubborn cow
    Offline

    2
    ReputationRep:
    GUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU UUUUUYS

    did we have 2 six markers in b2??????????//
    Offline

    10
    ReputationRep:
    (Original post by coreHelp)
    GUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU UUUUUYS

    did we have 2 six markers in b2??????????//
    yh think so
    Offline

    10
    ReputationRep:
    (Original post by hansa123)
    yes you did just because you didnt doesnt mean you have to be a stubborn cow
    this is for the photosynthesis 6 mark question right?
    Offline

    2
    ReputationRep:
    (Original post by coreHelp)
    GUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU UUUUUYS

    did we have 2 six markers in b2??????????//
    1, b3 had 2
    Offline

    10
    ReputationRep:
    (Original post by theholychilli)
    Plantains question's answer was 1600, all of my class got this. Also an advantage for hydrogen peroxide question is that is does not require a high temperature
    no you probably forgot to divide by 100 becuase converting cm to m is ividing by 10000 not 100.
    Offline

    9
    ReputationRep:
    (Original post by funky2722)
    yh think so
    6 Marker and 5 Marker on Speciation
    Offline

    11
    ReputationRep:
    (Original post by YAY GCSE)
    Wasnt the question just: why would using stem cells from the childs umbilical cord not help the childs genetic disorder?
    Because the DNA coding for the genetic disorder would be present in the umbilical cord cell


    Posted from TSR Mobile
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Has a teacher ever helped you cheat?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Write a reply...
    Reply
    Hide
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.