A level Biology: Post your doubts here!

[redd]

How was the paper everyone?

Uh... check this out:
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s13_gt.pdf

I too think it would be around 35, Last year's paper was way too easier. I have never seen paper of this level before!
And time management disturbed me too, but Alhamdulillah i didn't left any.

 

[princeali97]

I would say the paper was a bit lengthy.I didn't get time to revise it.But yes it was comparatively easier than last year's paper.

 

[princeali97]

How did it go guys? Mine went SO SO BAD I left questions. I don't know what happend I guess there's no way I can get an A now that theory went SO bad

Dont worry u still have a chance to overcome.Give your best in paper 1 and 3.

 

[princeali97]

Don't worry. Friend of mine prepared A LOT and he said the exam, also variant 22, was freaking hard. I think the grade boundaries will be lower maybe 45 for A. I wonder how difficult 42 is gonna be

I think the grade boundary will be high becuz in may/june session most of the school candidates are giving the exam and there is more competition.Lets c lets hope for the best.

 

[Sarah_3420]

question 1d 2013 may june p23 thanks !

 

[♣♠ Magnanimous ♣♠]

Wow. This material is really helpful but I'm on my A2. Do you have one like this for A2 biology or A2 chemistry ?

sorry boss till now i didnt get that material but i will surely find if i get.

 

[mynameisnotneeded]

How was the paper everyone?



I too think it would be around 35, Last year's paper was way too easier. I have never seen paper of this level before!
And time management disturbed me too, but Alhamdulillah i didn't left any.

They have never asked some of these questions before. Ever. Expect a lower boundary coz I don't think everyone would have done well in the new questions. I did

 

[Sarah_3420]

When do i mention that Co2 binds with haemoglobin forming carbaminoheamoglobin ?

 

[muhammad05]

They have never asked some of these questions before. Ever. Expect a lower boundary coz I don't think everyone would have done well in the new questions. I did

OMFG you guys are scaring me. P21 in 2 hours and Im shitting myself.

 

[Ahmed Shazly]

Hello guys can anyone write a small summary for me about the most important points of biological molecules as i didnt have enough time to study it.Thanks in advance

 

[AmeeraKhan]

I have a couple of doubts regarding Evolution:
1. Explain how all organisms can potentially overproduce.
2. describe the processes that affect allele frequencies in populations with reference to the global distribution of malaria and sickle cell anaemia.

 

[areebaization]

I have a couple of doubts regarding Evolution:
1. Explain how all organisms can potentially overproduce.
2. describe the processes that affect allele frequencies in populations with reference to the global distribution of malaria and sickle cell anaemia.

Second question is about natural selection.
As one phenotype is favored, their allele frequency will increase. For eg: In the areas where malaria is common we see more people with sickle cell anaemia as this phenotype is at a selective advantage (Malarial parasite affects healthy RBCs not SCAnamic RBCs)
However, in the areas where Malaria is not common SCAnamic alleles are at selective disadvantage. So SCA allele is less in these places.

 

[BeBeskii108]

sorry boss till now i didnt get that material but i will surely find if i get.

Ok

 

[BeBeskii108]

Does genetic drift mean change in frequency of alleles ?

 

[♣♠ Magnanimous ♣♠]

Does genetic drift mean change in frequency of alleles ?

1. variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce.
2. it means a type you told is right.

 

[siraj acharya]

how was everyones paper ?

 

[emogurl_gl]

yah but that's the thing i dont get!!!
can u post a drawn pic of it?

Hmmmmm

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Can u see it? LOL
and the second line touches the point where the plateu started

 

[♣♠ Magnanimous ♣♠]

awesome.

how was everyones paper ?

 

[AmeeraKhan]

Second question is about natural selection.
As one phenotype is favored, their allele frequency will increase. For eg: In the areas where malaria is common we see more people with sickle cell anaemia as this phenotype is at a selective advantage (Malarial parasite affects healthy RBCs not SCAnamic RBCs)
However, in the areas where Malaria is not common SCAnamic alleles are at selective disadvantage. So SCA allele is less in these places.

Ah, I see... Thanks

 

[sidbloom1995]

Hmmmmm

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Can u see it? LOL
and the second line touches the point where the plateu started

hahah it's fine!!
the paper is over for now!!!
and i think i kind of get it ~_~