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Edexcel B3 unofficial markscheme 19th June 2017 Watch

  • View Poll Results: What mark do you think you got?
    55+
    23
    8.65%
    47-54
    98
    36.84%
    39-46
    88
    33.08%
    30-38
    40
    15.04%
    22-29
    12
    4.51%
    Under 22
    5
    1.88%

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    (Original post by Zainyg)
    what was the 3 mark calculation?
    24
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    (Original post by jashab14)
    Everyone in my school got 24 but to be honest, they didn't make it clear as to whether the 0.925% and 0.625% was of the entire 16,000 or out of the two 8,000 groups
    IT LITERALLY SAYS "Split equally"
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    Here is the long awaited markscheme. I think the grade boundaries will be pretty low but overall I think personally I did okay – Please remember you can bring up your grade with the other exams and don’t worry if you get wrong answers! Feel free to add to the markscheme below as I can’t remember all the questions. Good luck!

    1a. Species 1 because the nectar is at the top

    1b. Option D

    1c. Co-evolution: As one species evolves the other devolves so moth becomes deformed so its proboscis shrinks so co-evolution benefits the orchid, not the moth

    2a. Dominant allele = Male Recessive allele = Female OR Isotope monitor

    Classical conditioning

    Put a flag in front of horse to habituate it

    38 HIV

    Vegetarian cheese à use restriction enzyme to combine milk together to make it yellow and clot to form cheese and then put it into a fermenter

    Lactose free-milk à Normal milk + sieve + barium nitrate, so lactose is extracted. Include conditions of pH, temperature and contamination
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    (Original post by Olivia2442)
    What did people get for the punnett square question?
    50% is the correct answer, as we are assuming that the sex was male, the chance of inheritence is 50% rather than 25%.
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    (Original post by dd897)
    Here is the long awaited markscheme. I think the grade boundaries will be pretty low but overall I think personally I did okay – Please remember you can bring up your grade with the other exams and don’t worry if you get wrong answers! Feel free to add to the markscheme below as I can’t remember all the questions. Good luck!

    1a. Species 1 because the nectar is at the top

    1b. Option D

    1c. Co-evolution: As one species evolves the other devolves so moth becomes deformed so its proboscis shrinks so co-evolution benefits the orchid, not the moth

    2a. Dominant allele = Male Recessive allele = Female OR Isotope monitor

    Classical conditioning

    Put a flag in front of horse to habituate it

    38 HIV

    Vegetarian cheese à use restriction enzyme to combine milk together to make it yellow and clot to form cheese and then put it into a fermenter

    Lactose free-milk à Normal milk + sieve + barium nitrate, so lactose is extracted. Include conditions of pH, temperature and contamination
    for 1a, you mean species 2, as they have a longer beak, so they can reach the the necter
    And its not "classical conditioning"; it's operant..
    "Put a flag in front of horse to habituate it " - JUST NO
    "Dominant allele = Male Recessive allele = Female OR Isotope monitor" - nope, If sperm = X, then female; if sperm = Y, then male.
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    (Original post by dd897)
    Here is the long awaited markscheme. I think the grade boundaries will be pretty low but overall I think personally I did okay – Please remember you can bring up your grade with the other exams and don’t worry if you get wrong answers! Feel free to add to the markscheme below as I can’t remember all the questions. Good luck!

    1a. Species 1 because the nectar is at the top

    1b. Option D

    1c. Co-evolution: As one species evolves the other devolves so moth becomes deformed so its proboscis shrinks so co-evolution benefits the orchid, not the moth

    2a. Dominant allele = Male Recessive allele = Female OR Isotope monitor

    Classical conditioning

    Put a flag in front of horse to habituate it

    38 HIV

    Vegetarian cheese à use restriction enzyme to combine milk together to make it yellow and clot to form cheese and then put it into a fermenter

    Lactose free-milk à Normal milk + sieve + barium nitrate, so lactose is extracted. Include conditions of pH, temperature and contamination
    wasnt the nectar at the bottom and the conditioning was operant
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    (Original post by 205live)
    wasnt the nectar at the bottom and the conditioning was operant
    That is what I got
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    (Original post by dd897)
    Here is the long awaited markscheme. I think the grade boundaries will be pretty low but overall I think personally I did okay – Please remember you can bring up your grade with the other exams and don’t worry if you get wrong answers! Feel free to add to the markscheme below as







    I can’t remember all the questions. Good luck!

    1a. Species 1 because the nectar is at the top

    1b. Option D

    1c. Co-evolution: As one species evolves the other devolves so moth becomes deformed so its proboscis shrinks so co-evolution benefits the orchid, not the moth

    2a. Dominant allele = Male Recessive allele = Female OR Isotope monitor

    Classical conditioning

    Put a flag in front of horse to habituate it

    38 HIV

    Vegetarian cheese à use restriction enzyme to combine milk together to make it yellow and clot to form cheese and then put it into a fermenter

    Lactose free-milk à Normal milk + sieve + barium nitrate, so lactose is extracted. Include conditions of pH, temperature and contamination

    It was option C wasn't it?
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    (Original post by Fernbank2016)
    It was option C wasn't it?
    Yeh, that markscheme is full of BS, don't trust it.
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    (Original post by Schoolstudent01)
    I got 48 people

    I used the total to work out the percentage of the total and got 100 or one and 148 for the other. 148-100= 48

    Did anyone else do this?
    this is exactly what I did, I don't understand which other way there is?!
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    (Original post by astralnerd)
    this is exactly what I did, I don't understand which other way there is?!
    mate, it says the expirement is split in half between 16000 people; so its 8000 each.
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    (Original post by leena480)
    I got 48 too to be honest, but my friends said that the 16000 people were divided into 2 groups, anyways I think they might just cut 1 mark for not dividing by 2.
    I thought the percentage of people that still had HIV was out of the 16000, but people say it was 0.625% of group 1 and 0.925% of group 2 but not sure...
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    8000*0.925%=74
    8000*0.625%=50
    74-50=24
    It's 24 b
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    (Original post by stephen1011)
    50% is the correct answer, as we are assuming that the sex was male, the chance of inheritence is 50% rather than 25%.
    it was just out of the entire punnet square not just male offspring
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    (Original post by Fernbank2016)
    It was option C wasn't it?
    Nope the nectar was deep in the plant the pollen was at the top its species 2
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    (Original post by Bartholemew)
    Nope the nectar was deep in the plant the pollen was at the top its species 2
    No because the pollen is at the top so both moths will still try but only one will get the nectar but both can pollinate it.
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    (Original post by Bartholemew)
    Nope the nectar was deep in the plant the pollen was at the top its species 2
    It was option C, the multiple choice question as about pollen. Both hawk moths could get the pollen but only one could get the nectar
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    are you sure because I put 25%, others are saying 50%
    (Original post by MIKESPIKE10)
    it was just out of the entire punnet square not just male offspring
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    (Original post by dd897)
    Here is the long awaited markscheme. I think the grade boundaries will be pretty low but overall I think personally I did okay – Please remember you can bring up your grade with the other exams and don’t worry if you get wrong answers! Feel free to add to the markscheme below as I can’t remember all the questions. Good luck!

    1a. Species 1 because the nectar is at the top

    1b. Option D

    1c. Co-evolution: As one species evolves the other devolves so moth becomes deformed so its proboscis shrinks so co-evolution benefits the orchid, not the moth

    2a. Dominant allele = Male Recessive allele = Female OR Isotope monitor

    Classical conditioning

    Put a flag in front of horse to habituate it

    38 HIV

    Vegetarian cheese à use restriction enzyme to combine milk together to make it yellow and clot to form cheese and then put it into a fermenter

    Lactose free-milk à Normal milk + sieve + barium nitrate, so lactose is extracted. Include conditions of pH, temperature and contamination
    Honestly don't think I've seen a *****er marks scheme in all my days
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    That mark scheme isn't good... I'm pretty sure it was option 2 for the first one and C for the first multiple choice, and both parties benefit in co evolution, there was a 1 marker on how the moth benefits wasn't there?
 
 
 
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