Edexcel A-level Biology B Paper 2 (9BI0 02) - 16th June 2023 [Exam Chat]

Poll

How did your Edexcel A-level Biology B Paper 2 exam go today?

Edexcel A-level Biology B Paper 2 (9BI0 02) | 16th June 2023 [Exam Chat]

Welcome to the exam discussion thread for this exam. Introduce yourself! Let others know what you're aiming for in your exams, what you are struggling with in your revision or anything else.

Wishing you all the best of luck.

General Information
Date/Time: 16th June/ AM
1h 45m

Reply 1

Hehehehehee

7

How is everyone's revision going?

Reply 2

MiriGyu

11

Original post by Hehehehehee

How is everyone's revision going?

Paper 2 is stressing me out alot since we hard to rush though ecosystems and the end of topic 9. Luckily there's a good gap between p1 and 2. Wbu?

Hate topic nine !

Original post by MiriGyu

Paper 2 is stressing me out alot since we hard to rush though ecosystems and the end of topic 9. Luckily there's a good gap between p1 and 2. Wbu?

It’s been going good. I’ve just gotta brush over the last few topics. Fingers crossed we’ll do well!!!

Reply 5

username5176820

4

Hi, are there Edexcel B biology papers 2 and 3 videos being solved on youtube or at other sites? Most videos are on AQA papers on youtube.
Thanks.

Reply 6

ifif4

13

Does anyone know of any websites/ videos for good notes for topic 10. I just don't get anything in topic 10.

Reply 7

phoebelf

5

only one I have found is physics and maths tutor! theres literally none for our exam board :frown:

Original post by ifif4

Does anyone know of any websites/ videos for good notes for topic 10. I just don't get anything in topic 10.

Reply 8

nouranicus

2

Original post by ifif4

Does anyone know of any websites/ videos for good notes for topic 10. I just don't get anything in topic 10.

I know a really good website, it's American but it's doing the job and all the content on the Edexcel spec is there with a little extra. It's called CK-12 and It's free with some good quizzes at the end of lessons. I recommend you go on the 'College Human Biology' course and onto 'Ecology'. They also add videos to some of the lessons.

Hope this helps

Reply 9

67824930

9

I don’t understand topic 9 at all

Reply 10

nouranicus

2

Original post by 67824930

I don’t understand topic 9 at all

Check out CK-12 (https://flexbooks.ck12.org/cbook/ck-12-college-human-biology-flexbook-2.0/section/10.5/primary/lesson/central-nervous-system-chumbio/) ' College human biology' Sections 10 and 18 will have everything

Reply 11

ifif4

13

Can someone please explain how you get 1183 as the answer for this hardy Weinberg question?

Original post by ifif4

Can someone please explain how you get 1183 as the answer for this hardy Weinberg question?

first of all, you have to use the stem of the question, it's not included in the files you attached, but i found it so i can help out,

the stem has told us that the allele is recessive hence 5250 is the number of recessive alleles in 2015, the total is 5250+1250= 6500 of both recessive and dominant alleles.

with this we can find out the number of recessive alleles from the total hence we do 5250/6500= 0.8076923

this number equates to q^2 as homogenous recessive was 5250 hence we can now work out q by square rooting 0.8076923 which equals to 0.898717

we can now work out p which is just rearranging the equation p+q=1 to 1-q=p or p=1-q

so 1-0.898717= 0.1012829657

the question has asked for how many heterozygous alleles there are hence we work out 2pq so we multiply p and q and then multiply by 2 to get 0.1820494462. Now we can work out the answer by multiplying 2pq to the total number of alleles in 2015 which is 6500, so:

0.1820494462x6500 = 1183!

Hope that helps! :smile:

btw for anyone wondering which question this is, go to physics and maths tutor, topic 8 and its the revision section questions from 2021 onwards, 8.3 gene pools question 5.

(edited 10 months ago)

Reply 13

ifif4

13

Original post by AAMEH

first of all, you have to use the stem of the question, it's not included in the files you attached, but i found it so i can help out,

the stem has told us that the allele is recessive hence 5250 is the number of recessive alleles in 2015, the total is 5250+1250= 6500 of both recessive and dominant alleles.

with this we can find out the number of recessive alleles from the total hence we do 5250/6500= 0.8076923

this number equates to q^2 as homogenous recessive was 5250 hence we can now work out q by square rooting 0.8076923 which equals to 0.898717

we can now work out p which is just rearranging the equation p+q=1 to 1-q=p or p=1-q

so 1-0.898717= 0.1012829657

the question has asked for how many heterozygous alleles there are hence we work out 2pq so we multiply p and q and then multiply by 2 to get 0.1820494462. Now we can work out the answer by multiplying 2pq to the total number of alleles in 2015 which is 6500, so:

0.1820494462x6500 = 1183!

Hope that helps! :smile:

btw for anyone wondering which question this is, go to physics and maths tutor, topic 8 and its the revision section questions from 2021 onwards, 8.3 gene pools question 5.

Thank you so much for your help

Reply 14

sylkiebot

10

This might sound stupid but does anyone know how to solve this I am so confused. Are we doing NPP=GPP-R?

Screen Shot 2023-06-14 at 8.02.12 PM.png101.4KB

Reply 15

username5176820

4

Hi

Is writing in bullet points on Edexcel B biology papers okay, or is prose style preferable?

Thanks.

Reply 16

Possiblyme

3

Original post by sylkiebot

Original post by sylkiebot)This might sound stupid but does anyone know how to solve this I am so confused. Are we doing NPP=GPP-R?

I’ll try and explain this as best as I can. But short answer is you are working out the energy that is passed on and dividing it by the total energy of the producers and then multiplying by 100 to get a percentage.

Worked out answer:
first I worked out what was lost from the producer so that’s (4.4x10^4) + (8.4x10^4) and that gives us an answer if 12800.
then I did the energy of the producer subtracted by the energy lost (previous answer) so that is (1.4x10^5) - 12800 and that gives an answer of 12000.

now we divide our previous answer, which is the energy passed on to the primary consumer, by the total energy of the producer so that is 12000/1.4x10^5 and then multiply by 100 to give us a percentage and that gives us an answer of 8.6% which is the final answer. Hope this helps

Reply 17

sylkiebot

10

Original post by Possiblyme

I’ll try and explain this as best as I can. But short answer is you are working out the energy that is passed on and dividing it by the total energy of the producers and then multiplying by 100 to get a percentage.

Worked out answer:
first I worked out what was lost from the producer so that’s (4.4x10^4) + (8.4x10^4) and that gives us an answer if 12800.
then I did the energy of the producer subtracted by the energy lost (previous answer) so that is (1.4x10^5) - 12800 and that gives an answer of 12000.

now we divide our previous answer, which is the energy passed on to the primary consumer, by the total energy of the producer so that is 12000/1.4x10^5 and then multiply by 100 to give us a percentage and that gives us an answer of 8.6% which is the final answer. Hope this helps

Thank you so much!!!

Reply 18

ifif4

13

Can someone please explain how to interpret standard deviation results like when the +/- values overlap or not and if they have significant difference?