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F215 - Revision thread 13th June 2011

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Reply 2540

I'mBadAtMaths

Mumford and sons will guide me through!

Reply 2541

heartskippedabeat

Original post by I'mBadAtMaths

Mumford and sons will guide me through!

ing myself.

what do people think the two 8 markers will be? (theres usually two 8 markers isnt there)?

Reply 2544

daddeee

Anybody know anything about the Hardy Weinburg Principle? :confused:

Reply 2545

TobeTheHero

Original post by Ralphus J

what do people think the two 8 markers will be? (theres usually two 8 markers isnt there)?

8marks could be on anything!

Reply 2546

Tetanus

Original post by Ralphus J

what do people think the two 8 markers will be? (theres usually two 8 markers isnt there)?

There are always 2 long answer question - yes.

The Jan 11 and June 2010 had:

- Affects of Flight or Fight Response on Muscles
- Comparisons between PCR and in vivo gene cloning
- Translation and Transcription then the role of Polypeptides in th bodies development
- The process by which bacteria can be genetically modified to produce a certain protein

Reply 2547

Tetanus

Original post by daddeee

Anybody know anything about the Hardy Weinburg Principle? :confused:

It is just a way of looking a allele frequecy I think. Are they the "p + q = 1" and similar equations?!

What else do we need to know?

Reply 2548

I'mBadAtMaths

Original post by Tetanus

the June 10 big boys were a lot easier than the jan 11 ones yall

Reply 2549

tea kid

Are we given the Hardy Weinburg equation, or should I probably start to memorise it :K:

Reply 2550

I'mBadAtMaths

Man the balance of stimulation between my sympathetic and parasympathetic neurones is all over the place right now!

Reply 2551

Hazel92

does anybody know where i can get the jan11 markscheme, just did it and i dont have the answers

Reply 2552

-Jaz-

Original post by daddeee

Anybody know anything about the Hardy Weinburg Principle? :confused:

Assumptions:

1. Very large population
2. Random mating between individuals
3. No selection
4. No random mutation
5. No genetic drift / migration

And basically, we assume that there are only 2 alleles, and use the formula

p^2 + q^2 + 2pq = 1,

where p = dominant allele and q = recessive allele

so basically, p^2 = homozygous dominant
q^2 = homozygous recessive
and 2pq = heterozygous

and we use the whole hardy-weinberg equation to work out the percentage of the population with the dominant allele, or recessive allele, or the percentage who are homozygous dominant or recessive, etc.

Reply 2553

joestevens2092

Original post by CoventryCity

I thought genetic drift was when a certain allele is passed on simple by chance?

Yeah you're right. Looks like they've described natural selection/ directional selectional

Reply 2554

Tetanus

Original post by tea kid

Are we given the Hardy Weinburg equation, or should I probably start to memorise it :K:

CGP says to learn them, but they can't even put funny jokes on the backs of their revision guides any more, so you can't trust them. :mad:

I guess you should just learn them

Reply 2555

-Jaz-

Original post by Hazel92

does anybody know where i can get the jan11 markscheme, just did it and i dont have the answers

type in f215 jan 2011 mark scheme in google - there's a PDF link - i found it yesterday using that :smile:

Reply 2556

-Jaz-

Original post by tea kid

Are we given the Hardy Weinburg equation, or should I probably start to memorise it :K:

Original post by Tetanus

CGP says to learn them, but they can't even put funny jokes on the backs of their revision guides any more, so you can't trust them. :mad:

I guess you should just learn them

Syllabus says you dont need to, but might as well - its not hard, just a simple quadratic equation - p^2 + q^2 + 2pq = 1 :biggrin:

Reply 2557

Tetanus

Original post by Hazel92

does anybody know where i can get the jan11 markscheme, just did it and i dont have the answers

http://www.scribd.com/doc/57232953/OCR-F215-JAN-11-Control-Genomes-and-Environment-MS-MARK-SCHEME

:wink:

Reply 2558

sickofexamz

In the heinemann book on 2.1 spread 8, in the process of prophase 1 what does it mean by
'each pair consists of one maternal and one paternal chromosome'

From the diagram it seems that each consists of either two maternal or two paternal chromosome, I don't understand!
Please help!

Reply 2559

ksahnan