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BIOL4 Biology Unit 4 Exam - 13th June 2011

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Yeah i got 4% for Hardy Weinburg.

And wrote about ammonification and then both nitrification stages to get nitrates so plant can actively transport them through root hair cells.

Thought the last 3 questions were okay, with the nitrogen, carbon and Calvin cycles.

Reply 881

Abby :)

Wooop, think that exam went okay. Alot better than the January 2011 one i originally sat, so lets hoping i got higher than an E this time around. LOL :|

Few dodgy questions here and there, but i was made up with the end 3 questions. <3

Reply 882

Laura-Robbie

okay cool sounds like about the same kind of stuff just in leser detail so i'm happy enough with that lol i only need a c so hopefully i've got that

Reply 883

*QueenBeee

is there gonna be an unofficial mark scheme up?

Reply 884

alicetalbot

I thought the Hardy-Weinberg question said all of the homozygotes?

Reply 885

Rickesh

Original post by Laura-Robbie

you know the one about the horse eating extra food in the summer what did people say it used the extra nutrients for. i know its only one mark but i wasn't too sure what to out, i put growth but i dont know if that is right or not

I said that the horse would store the nutrients and use it the following winter?? :s

Reply 886

cws121

i got 4% for hardy weinbug, it defo said homozygous recessive. i must of read it about 10 times because i thought it was a trick question

Reply 887

Laura-Robbie

i think it was homozygous recesive it wanted coz it was the t for the allele that wouldn't code for an enzyme or something, what type of selection did everyone put??

Reply 888

Rickesh

I got 4% for the hardy weinburg too ! What did everyone put for the question following that about what they hardy weinburg predicts will happen to the t allele or something like that??

Reply 889

Steerforth

Original post by Laura-Robbie

i think it was homozygous recesive it wanted coz it was the t for the allele that wouldn't code for an enzyme or something, what type of selection did everyone put??

Didnt really have to use the equation which was strange, but i pit 4% also.

I put directional selection, not too sure though.

Reply 890

Laura-Robbie

i put that it predicts it wont change from one generation to the next providing natyral selection and mutations don't take place, what did everyone put for the type of selection i reaslly wasn't sure but put stabilising selection because there was no change in the environmental temperature or anything??

Reply 891

tehsponge

That Hardy Weinberg one REALLY threw me. First of all, you didn't even have to use the HW equation, which it told you to use. Also 4% seemed really low, but thats what everyone else got in my class.

Reply 892

Rickesh

Original post by Laura-Robbie

I put directional because the environment is changing and the phenotypes also change?

Reply 893

cws121

i put directional because it was the those in the extremes (i.e. those with the t allele) were being eliminated from the population

Reply 894

tehsponge

Original post by Steerforth

Didnt really have to use the equation which was strange, but i pit 4% also.

I put directional selection, not too sure though.

I put stabilising but I think it could have been either...

Reply 895

tehsponge

Original post by cws121

i put directional because it was the those in the extremes (i.e. those with the t allele) were being eliminated from the population

But that also happens with stablising.

Reply 896

cws121

what did every get for the cats ratio, 1:1 ??

Reply 897

Laura-Robbie

Original post by cws121

i put directional because it was the those in the extremes (i.e. those with the t allele) were being eliminated from the population

isn't that stabilising though because it centres around the mean i.e the extremes are eliminated. directional is when it moves to the extremes and they are being selected for?? please correct me if i'm wrong

Reply 898

alicetalbot

It favoured one allele therefore must be directional surely? As it favours one extreme

Reply 899

Boo!xx

I got 4% for hardy, but some people in our class got 80%!?!?

And i put directional selection...
I hated the question were it was like use 'probability' and 'chance', i never did understand those :/