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A2 Biology OCR June 2015 Revision Thread

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Original post by peanutcracker20
Can anyone explain how to do hardy weinberg for this question http://www.ocr.org.uk/Images/58628-question-paper-unit-f215-control-genomes-and-environment.pdf its 7cii


Black = Dominant phenotype (p^2 and 2pq)
Red = Recessive phenotype (q^2)

Population size = 296 + 50 = 346

To work out q^2 we divide the number of recessive phenotype individuals by the total number of individuals. 296/346. (Don't round it here as that could lead to mistakes later).

q is just the square root of q^2 so square root 296/346 which gives 0.92
p = 1 - q. 1 - 0.92 = 0.08.
Original post by medactuary
wow how do you know that?! thank you!


I'm magic.
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njnj
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Original post by peanutcracker20


this video helped me a lot for hardy weinberg
https://www.youtube.com/watch?v=xPkOAnK20kw
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Original post by bmunro
You are just like me, I feel so stupid that I abused this exam till last minute and am still cramming now... I can't believe I didn't realise the amount there was that I couldn't remember and I worked to hard in previous weeks on it but it's all just gone from my memory :frown: don't think I will make uni now :frown:


same here its so frustrating
Good luck guys!!!!!!!!!!!!!!!! we can do it!!! :smile:
Original post by Munrot07
Black = Dominant phenotype (p^2 and 2pq)
Red = Recessive phenotype (q^2)

Population size = 296 + 50 = 346

To work out q^2 we divide the number of recessive phenotype individuals by the total number of individuals. 296/346. (Don't round it here as that could lead to mistakes later).

q is just the square root of q^2 so square root 296/346 which gives 0.92
p = 1 - q. 1 - 0.92 = 0.08.


thank you, helped a lot :smile:
Good luck everyone!

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When you learn the sliding filament theory in 5 minutes and you're like wow why was i bothered.
Dear University, I failed Biology because F215 was the 8th exam I've had on 8 consecutive school days.
Dear University, I failed Physics because Unit 5 was the 9th exam I've had on 9 consecutive school days.
Dear University, I failed Chemistry because what the hell was that NMR supposed to be
Any predictions?
Original post by alexthehuman
Any predictions?


Probably everything you haven't revised for lol
Original post by Crystalz
When you learn the sliding filament theory in 5 minutes and you're like wow why was i bothered.



Well I literally don't know that at all so I'm praying that doesn't come up


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bmunro
What big questions have yet to come up? Have a feeling sliding filament theory hasn't yet..
Original post by Shostakovish
It is the absorbed - respired


Lol wat. Haha thanks
Original post by GianluigiBuffon
its just absorbed - respired fam


Lol thanks x'D
Time to face death guys... GOODLUCK!
Paper was meh. That's my chance of an A gone
Lots of suggest question. I don't know how I felt about that...
Original post by YouAgain
Lots of suggest question. I don't know how I felt about that...


I know. half the paper was basically synoptic stuff
Wasnt keen, felt like a lot was guessing rather than straight-forward knowledge based questions. :frown: What did people get for chi square?

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