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AQA BIOL2~3rd June 2013~AS Biology (Now Closed)

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Original post by DannyRedman
For index of diversity anyone get 80(79) divided by 906 which gave 6.98?????


i got this.
Reply 3481
Avatar for amylaq
amylaq
2
Original post by tumblrgirl
I'm pretty sure it was 1:200
30 people founded the Amish population, one of which had this genetic disorder. Currently one in 200 Amish people have the disorder however it is very rare for the rest of Americans.
This is DEFINATELY what the information stated, I'm sure of it :smile:
Original post by P-121
i rounded to 7.0 - do you think i'll get the mark?


Not sure. My bio teacher never seems worried about s.f
Original post by purple_panther
I put that:
1. longer females will be capable of laying more eggs so produce a bigger number of offspring
2. (a completely random guess) that the offspring will be longer so have a better chance of survival/advantage over its prey.

Because in the question it said snakes are predators that lay eggs so I thought why would they just put that in there if it wasn't relevant.


the mother can protect the egg better i said grr.
Reply 3484
Avatar for Blobar
Blobar
15
Not much actual knowledge required in this exam stupidly enough.

/applauds AQA.
lets finish the unofficial mark scheme guys
Did the spiracles open 6 times ever minute?!? :s
Also, does haemoglobin go through condensation reactions?! :s

Thanks for the help guys
Original post by star10159
diffusion through membrane faster when gas dissolved in water (thats why alveoli are moist)



No you're wrong
Water increases the diffusion pathway
Original post by Dan1300
On the chromosome picture question it said draw what the chromosomes would look like after MEIOSIS. That means that you have to shade in the ends of one or two of them to show the "crossing over part".
Also on the snake one it said in the question suggest two factors OTHER than age. So i put same time for experiment to take place and same environmental conditions eg temperature


But by definition crossing over is both random and infrequent, so isn't it more probable that crossing over wouldn't occur in which case you wouldn't have to shade in the ends of one or two?


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Original post by reubenkinara
Not sure. My bio teacher never seems worried about s.f



You would get 1 mark out of the 2-- it was on a mark scheme once
Reply 3490
Avatar for Blobar
Blobar
15
I doubt many of us can remember the questions since half of them asked you the same crap.
What's considered a low grade boundary for this exam, what's the lowest grade boundary there's been so far out of 85, and what do you predict for re grade boundaries for this exam?
Reply 3492
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sar-egy
Original post by Blobar
Me too lol, it shouldnt be wrong though but we probably wont get a mark. Was just so confusing.


I put that too at the start then changed it. shouldn't have changed it :frown:
Reply 3493
Avatar for bunny96
bunny96
Original post by purple_panther
I put that:
1. longer females will be capable of laying more eggs so produce a bigger number of offspring
2. (a completely random guess) that the offspring will be longer so have a better chance of survival/advantage over its prey.

Because in the question it said snakes are predators that lay eggs so I thought why would they just put that in there if it wasn't relevant.


Those are the exact two reasons I put! Hopefully they're right
Original post by momo26396
You would get 1 mark out of the 2-- it was on a mark scheme once

I see. I did it to 1 d.p.
Original post by Tinuviel
No you're wrong
Water increases the diffusion pathway

efficient gas exchange requires:
large SA
moistness
short diffusion pathway
large concentration gradient
A = 60
100 ums= 72
%Increase: 343%
Fetus%: 16%
Spiracles open: 6 times.
Amish people: 250,000
Index diversity: 6.98
Woo! :smile: Anyone else?
Original post by momo26396
Did the spiracles open 6 times ever minute?!? :s
Also, does haemoglobin go through condensation reactions?! :s


Yeah it's amino acids joining together
Thanks for the help guys


Original post by Tinuviel
No you're wrong
Water increases the diffusion pathway


It reduces the diffusion pathway as it is drawn deeper in the tracheoles
Paper was 75% HSW and 25% actual subject knowledge. Bit unfair on those who studied but a blessing for those who didn't.

VERY easy to lose a lot of marks in this paper I thought. Any predictions on grade boundaries?
I think it'll be 63/85 for an A and 58 for a B...

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