# AQA (A) BYA5 - Inheritance, Evolution and Ecosystems: Exam Discussion: watch

1. How did everyone find this paper?
I thought (compared to unit 6) it was better.

Got 0.18 for the heidy-winberg equation...

Anyone remember anything else?
2. yes 4 mrks in da bag lol

yeh 0.18! too

yeh module 5 was better den 6
3. dat antigen questionw as the tricketiest

and the insect question was hard...>>> thats bout it

rest was o ryte i guess
4. what did you get for the probabilty of a the couple having a boy with blood group A (i think it was A)
5. (Original post by cherc2005)
How did everyone find this paper?
I thought (compared to unit 6) it was better.

Got 0.18 for the heidy-winberg equation...

Anyone remember anything else?
yeay I got that too!!!!!!!!!! yippy
6. (Original post by cherc2005)
what did you get for the probabilty of a the couple having a boy with blood group A (i think it was A)
1/8 i think!

1/4 chance of A then always 1/2 chance of a boy... 1/4 +1/2 = 1/8

Prob wrong tho!
7. (Original post by cherc2005)
what did you get for the probabilty of a the couple having a boy with blood group A (i think it was A)
i put that there was a 25 percent chance to have a child with blood group A, a 50 perxcent change with Blood group AB and 25 perncent chance for it to have blood group B. Because of codominance. There is a 11 ratio. I hope this is right what did u put down.
1/8 i think!

1/4 chance of A then always 1/2 chance of a boy... 1/4 +1/2 = 1/8

Prob wrong tho!

did the question specify boy? I thought it said child
9. i got 1/8
10. I'm sure it said male! I'm not sure though!
I'm sure it said male! I'm not sure though!
oh no. do any of u remember how many marks this question was??
12. 2 or 3, i would imagine..probably 2
13. what are usually the grade boundaries for a 75 mark test? Do any of u guys know?
2 or 3, i would imagine..probably 2
oh k, but im 100 % sure that 1/8 is correct.
15. what degrees of freedom did u get

and bout the chi squared value being higher than 0.001 value
16. (Original post by Heidi)
what are usually the grade boundaries for a 75 mark test? Do any of u guys know?
These were the boundries for June 2004

Scaled Boundary Mark
Max: 75
A:52
B:47
C:42
D:37
E:33

Uniform Boundary Mark
Max:90
A:72
B:63
C:54
D:45
E:36
17. (Original post by hussain)
what degrees of freedom did u get

and bout the chi squared value being higher than 0.001 value
i put 1 for the degree of freedoms not sure though
18. (Original post by Heidi)
i put 1 for the degree of freedoms not sure though
So did i..

I put: (N-1) = 2-1 =1 degree of freedom
(Where N is the number of categories)
These were the boundries for June 2004

Scaled Boundary Mark
Max: 75
A:52
B:47
C:42
D:37
E:33

Uniform Boundary Mark
Max:90
A:72
B:63
C:54
D:45
E:36
thanks for that.
So did i..

I put: (N-1) = 2-1 =1 degree of freedom
(Where N is the number of categories)
and for the next question i put 0.05

and the next i put that it wasn't due to chance and that it was significant or something like that

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