CCEA Biology A2:2

Reply 40

marty809

i only did on punnet square crossing X[H]Y Aa with X[H]]X[h] Aa

Reply 41

sarahteggart

yeah 1/16 for the punnett squ. and sex-linked cos it was only affecting males. and it was recessive right?

Reply 42

startitup

I hadn't a baldy notion about any of it to be honest. The questions were just a bit strange to me.

Reply 43

lopikase123

2

Original post by b3n1

For the genetic question...i did 2 punnet squares...one for haemophilia and one for albinism... which each had a probability of 1/4 so i multiplied them to get 1/16 is that how everyone else did it? It took me ages because at first i did a dihybrid inheritance punnet square which did not work at all haha

I think you had to do it as a dihybrid inheritance square. 4 by 4.

Reply 44

jamster1991

i think i made a good call by skipping straight to the essay with one hour to go as i could see the paper was going to take ages!!!! With a star to they scale the ninty percent thing? or is it just 90% of the raw marks?

Reply 45

lopikase123

2

Original post by jamster1991

i think i made a good call by skipping straight to the essay with one hour to go as i could see the paper was going to take ages!!!! With a star to they scale the ninty percent thing? or is it just 90% of the raw marks?

overall, you need 270/300 UMS over the 3 A2 modules. That was a hard paper by all accounts so it will probably work out at a lot less than 90% raw marks. Figured at about 75-80 if even that high

Reply 46

michaelf12

does coursework (A2 3) count towards an A*?

Reply 47

lopikase123

2

Original post by michaelf12

does coursework (A2 3) count towards an A*?

yes An A* will be awarded to the candidates who attain an overall grade A in the
qualification and an aggregate of at least 90% of the uniform marks across the A2 units
The only problem is that the coursework usually gets marked down quite a bit

Reply 48

d3ano

People, a bit of reassurance in that all the exams are scaled up a lot. For example, in the exam in January (A21) I got 76 and it was scaled up to 119. Hopefully this will be scaled up even more because the January paper was no where near as hard! All the best for the rest of the exams!

Oh, with regards to the confidence limits: If I got he wrong value for t because I was really stupid :P, but used the formula right and drew on the graph right will I lose all the marks or just some of the 4?

Apart from that, the test was a struggle due to time, but do-able I think!

Reply 49

joneasy

Original post by lopikase123

yes An A* will be awarded to the candidates who attain an overall grade A in the
qualification and an aggregate of at least 90% of the uniform marks across the A2 units
The only problem is that the coursework usually gets marked down quite a bit

Lopikase is a faggot of the highest order, that much is for sure.

Reply 50

Amy563

I've a silly question about confidence limits... how do you actually find the t value? I've no idea if I did the right thing because in the examples we got in class we were always given a t value already :/. Did n-1=4 and then use p=0.05?

Reply 51

b3n1

OP

Original post by Amy563

I've a silly question about confidence limits... how do you actually find the t value? I've no idea if I did the right thing because in the examples we got in class we were always given a t value already :/. Did n-1=4 and then use p=0.05?

Yes thats what i did...but i was unsure if the control counted as a category so my dof may have been different

Reply 52

Nobacherie

2

Disastrous. That is all.

Reply 53

Amy563

Original post by b3n1

Yes thats what i did...but i was unsure if the control counted as a category so my dof may have been different

I see your point about the control. I was having difficulty deciding whether to include it or not and I had 5 mins left at the end to do this question :/ but hopefully I'll get marks for the rest of it even if I shouldn't have included the control?

(edited 11 years ago)

Reply 54

thetobbit

11

Original post by b3n1

Yes thats what i did...but i was unsure if the control counted as a category so my dof may have been different

Mm I had the degrees of freedom as 9, 10 (dishes for each species)

I rushed it a bit though

Overall I liked the paper, funny because everyone seems to have hated it ;p Scale my marks go onnnnn

Reply 55

thetobbit

11

Original post by b3n1

For the genetic question...i did 2 punnet squares...one for haemophilia and one for albinism... which each had a probability of 1/4 so i multiplied them to get 1/16 is that how everyone else did it? It took me ages because at first i did a dihybrid inheritance punnet square which did not work at all haha

Mm I put them together and did a big 4 x 4 square. Got 1/16 as well

Reply 56

parawhore_VT

That test was thee worst biology test i've ever done by far, and was alot worse compared to past papers from the years before! did anyone else get 54.75 and 51.75 for the upper and lower limits?
totally messed up the punnet square too, i only did it ha,HA,Ha,hA x Ha HA and didnt include sex chromosome :frown:

is it too late to put your name in for a biology repeat module ?

(edited 11 years ago)

Reply 57

rmckinney924

definitely the worst exam i have ever sat

Reply 58

sdillon590

1

Original post by parawhore_VT

That test was thee worst biology test i've ever done by far, and was alot worse compared to past papers from the years before! did anyone else get 54.75 and 51.75 for the upper and lower limits?
totally messed up the punnet square too, i only did it ha,HA,Ha,hA x Ha HA and didnt include sex chromosome :frown:

is it too late to put your name in for a biology repeat module ?