# OCR 2010 A2 Biology Unit 2 - Control, Genome and EnvironmentWatch

8 years ago
#141
(Original post by Tinkerbelle ♥)
No same, I couldn't even tell you what it's for. All I can tell you is it involves maths. And complicated looking symbols.
Chi square basiaclly is based on Null hypothesis , in which the result you get from chi square (a value) tells if the hypothesis can be true or not for a particular experiment,mathematically its sigma (O-E)^2/E

where O: is the observed allele frequency,E: Expected frequency.
EDIT: made that in rush, would have posted more info but kinda busy atm.I will do once i get the time.
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8 years ago
#142
(Original post by ibysaiyan)
Chi square basiaclly is based on Null hypothesis , in which the result you get from chi square (a value) tells if the hypothesis can be true or not for a particular experiment,mathematically its sigma (O-E)^2/E

where O: is the observed allele frequency,E: Expected frequency.
EDIT: made that in rush, would have posted more info but kinda busy atm.I will do once i get the time.
Ahh thank you!! So is it's purpose kind of like Spearmans Rho? I'm going to go over it tomorrow Doesn't sound as scary as I was imagining, though!
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8 years ago
#143
Hey, I've got a couple of questions, rep for the best answer

1) Explain how cloning an animal can help save an endangered species of mammal?

2) State three ways of setting up a gene bank for the species being cloned?

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8 years ago
#144
hey guys havnt posted in a while but i think i'm in love with lac operon :Love:
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8 years ago
#145
(Original post by ILikeTheGame)
hey guys havnt posted in a while but i think i'm in love with lac operon :Love:
Hey, why whats with it?
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8 years ago
#146
(Original post by ibysaiyan)
Hey, why whats with it?
Because of switching off the offswitch XD - I assume lol
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8 years ago
#147
(Original post by win2kpro)
Because of switching off the offswitch XD - I assume lol
wait what switch lol? promoter xD?
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8 years ago
#148
So.. how is it going guys? =}
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8 years ago
#149
(Original post by ibysaiyan)
wait what switch lol? promoter xD?
Don't you mean operator? The promoter is where the RNA polymerase sits, the operator is where the inhibiter sits/binds to.
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8 years ago
#150
(Original post by xXxBaby-BooxXx)
Don't you mean operator? The promoter is where the RNA polymerase sits, the operator is where the inhibiter sits/binds to.
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#151
what exactly is an operator??
and can someone please tell me what stuff from AS is unit 2 module 1 buildin upon?? im confused here
haven't we learned about protein synsthesis last year?
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8 years ago
#152
(Original post by Remarqable M)
what exactly is an operator??
and can someone please tell me what stuff from AS is unit 2 module 1 buildin upon?? im confused here
haven't we learned about protein synsthesis last year?
The Operator is just a region/length of DNA where the inhibitor binds to. It's next to the structural genes (Z and Y) that code for lactose permease and beta-galactosidase.

And the protein synthesis we learnt about was mainly protein structure etc.
It builds upon biological molecules (structure of DNA and proteins) organelles (eg ribosomes) mitosis a small amount, selective breeding, dominant/recessive alleles, variation, kingdoom/domain/species and natural/artificial selection.

So it builds upon a lot. Hope that helps
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8 years ago
#153
(Original post by Remarqable M)
what exactly is an operator??
and can someone please tell me what stuff from AS is unit 2 module 1 buildin upon?? im confused here
haven't we learned about protein synsthesis last year?
Hey! welcome back, for unit 2 module one remember the basics meh whats transcription,translation,sickle cell anemia,apoptosis and operon region.I guess thats about it.Not much there... oh also homologous genes.
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#154
(Original post by xXxBaby-BooxXx)
The Operator is just a region/length of DNA where the inhibitor binds to. It's next to the structural genes (Z and Y) that code for lactose permease and beta-galactosidase.

And the protein synthesis we learnt about was mainly protein structure etc.
It builds upon biological molecules (structure of DNA and proteins) organelles (eg ribosomes) mitosis a small amount, selective breeding, dominant/recessive alleles, variation, kingdoom/domain/species and natural/artificial selection.

So it builds upon a lot. Hope that helps
Thank you. This is very useful and good luck with gettin an A* im glad you're part of this thread
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8 years ago
#155
(Original post by Remarqable M)
Thank you. This is very useful and good luck with gettin an A* im glad you're part of this thread
Oh I'm not getting an A* in...well anything tbh. I'm on a B in biology at the moment, I'd like an A, but even that's fairly unrealistic. Stupid HSW. I wish exams were just factual recall, I'm not too bad at that.

But thanks
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8 years ago
#156
(Original post by xXxBaby-BooxXx)
Oh I'm not getting an A* in...well anything tbh. I'm on a B in biology at the moment, I'd like an A, but even that's fairly unrealistic. Stupid HSW. I wish exams were just factual recall, I'm not too bad at that.

But thanks
Nah we will get there xD i dont think i will be getting an A* due to my last years practicals but meh an A would do .btw. remarq how is maths going =)?

Edit: I need some rest had a long session at the gym =/ .See you all later.
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#157
(Original post by ibysaiyan)
Nah we will get there xD i dont think i will be getting an A* due to my last years practicals but meh an A would do .btw. remarq how is maths going =)?

Edit: I need some rest had a long session at the gym =/ .See you all later.
not too bad i like everything in c4 except vectors.
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8 years ago
#158
(Original post by Remarqable M)
not too bad i like everything in c4 except vectors.
Hmm we can perhaps make one(thread) based on it :P?i wonder... anyways out for now.
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8 years ago
#159
(Original post by Remarqable M)
not too bad i like everything in c4 except vectors.
Urrrgh same. I hate vectors
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8 years ago
#160
Hey all.. how is it going ?
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