Edexcel B3 unofficial markscheme 19th June 2017

what was the 3 mark calculation?

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

What did people get for the punnett square question?

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

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

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?

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?!

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.

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 option C wasn't it?

Nope the nectar was deep in the plant the pollen was at the top its species 2

Nope the nectar was deep in the plant the pollen was at the top its species 2

it was just out of the entire punnet square not just male offspring

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