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AQA BIOL4 ~ 11th June 2013 ~ A2 Biology

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Reply 920

katiel8281

Original post by Gcayte

I got 6%

ME TOO!

Reply 921

Son234

Definitely high grade boundaries :frown:

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Reply 922

Tikara

Original post by pinkfairyarmadillo

Same!

yeah I think thats right (I got it wrong in the exam by thinking 1 out of 1000 meant the recessive allele silly me)

1 out of 1000 were homozygous recessive (q^2)

so 0.1%, so as a frequency 0.001 = q^2

so ROOT(0.001) = q = 0.0316....
1 - q = 0.968...

so 2(0.316..)(0.968..) = 0.061245...
as a percentage times by 100

= 6.12% (3sf)

is this what everyone else did?

Reply 923

master y

Original post by Son234

Definitely high grade boundaries :frown:

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Why? Wasnt that easy

Reply 924

Son234

Original post by master y

Why? Wasnt that easy

You don't think so?

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Reply 925

emah123

Original post by nathaan5

same 6.12% or something

yay!!! i got this! is my metheod ok: i did 1/1000 then sqaure rooted this answer, then minused from 1 to get the other allele frequecny then time these by 2?

Reply 926

Tikara

oh god I'm gonna stop looking at this thread haha I'll just see all the places I lost marks

can't believe I messed up the hardy weinberg!!!!!!!! :mad:

Reply 927

Beth_L_G

What did everyone write about advantages of using both bio and chem pest control?

Reply 928

emah123

how did everyone find it? i though it was an okayish paper but that means grade boundaries will be higher! :frown:

Reply 929

emah123

Original post by Beth_L_G

What did everyone write about advantages of using both bio and chem pest control?

i wrote the advantages of both and then wrote the using then together would be more cost effective and less time consuming. what did you write?

Reply 930

Teffie123

What did people put as answers for the enzyme Questions; something about why is Triose Phosphate lower in Iron Deficiency plants?

Reply 931

Beth_L_G

Original post by emah123

i wrote the advantages of both and then wrote the using then together would be more cost effective and less time consuming. what did you write?

Exactly the same here :smile:

Also wrote disadvantages of each and how using both minimises these

Reply 932

TH4RG3

Original post by Beth_L_G

What did everyone write about advantages of using both bio and chem pest control?

I said you use less chemical pesticides so less environmental damage, I said reduce leeching, kill more variety of pests? As biological is spcific to one pest.Biological is long lasting but slow and chemical acts straight away so you get benefits of both.

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Reply 933

amychan

Original post by Beth_L_G

What did everyone write about advantages of using both bio and chem pest control?

I wrote the advantages separately :frown:

like advantages of using chemical pesticides and advantages of using biological agent... is that okay? :s-smilie:

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Reply 934

TH4RG3

Original post by amychan

I wrote the advantages separately :frown:

like advantages of using chemical pesticides and advantages of using biological agent... is that okay? :s-smilie:

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No I dont think so it specifically said advantages of the mixed (integrated ot said didnt it?) system. It didnt ask for sperate advantages

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Reply 935

Yemiisii

Original post by Teffie123

What did people put as answers for the enzyme Questions; something about why is Triose Phosphate lower in Iron Deficiency plants?

Was that question about competitive inhibition?

Reply 936

amychan

Original post by Teffie123

What did people put as answers for the enzyme Questions; something about why is Triose Phosphate lower in Iron Deficiency plants?

I wrote something like less electrons transport in LDR-> less ATP and reduced NADP for the reduction of GP to TP

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Reply 937

lala12

Original post by Teffie123

What did people put as answers for the enzyme Questions; something about why is Triose Phosphate lower in Iron Deficiency plants?

Stuff about how less ATP made as electron transport chain in light dependent reaction would slow down, and also less NADPH formed as electron transport reduced. Then this would mean that less ATP and NADPH available to reduce GP to TP and so less TP made.

Reply 938

erica42

how many marks would you lose for putting 6% instead of 6.12%?

Reply 939

TH4RG3

Original post by Teffie123

What did people put as answers for the enzyme Questions; something about why is Triose Phosphate lower in Iron Deficiency plants?

I thought they were quite nice, less TP because of less ATP for it to be reduced, and less reduces NADP too (obviously in more detail)

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