# AQA Biology B2 - Unofficial Mark Scheme Watch

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< 10%
3.14%
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1.68%
> 30%
3.35%
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14.47%
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100%
2.83%

1. Parents Phenotype = Brown hair : Red hair Parents genotype = Bb : Bb Gametes genotype = B - b : B - b Offspring genotypes = BB Bb Bb bb (1 in 4 chance / 3:1 ratio) Offspring genotypes = Brown hair : Brown hair : Brown hair : red hair
2. (Original post by Blahblahblah7)
That's what I put I think and I revised it quite well

Phenotype is whet you see e.g. Brown hair
Genotype is what's there e.g. Bb
And for Dad I put XY and mum is XX
i put this aswell but people are saying its wrong ohwell
3. The question asking for the estimated number of plants in a field was 160,000 i think as the quadrant was 25cm X 25cm meaning the total area in m2 would be .25*.25*10 to give .635m2 so there are 32 plants per m2 and 32*100*50=160,000
4. (Original post by Naco88)
It said that it was an example of the equipment that you can use but if you used all 3 then it will probably get you the marks.
you also had to talk about how to make the test valid eg by using quadrats, transects etc.
5. what about the stem cell questions about an advantage and disadvantage to using stem cell from a childs own umbilical cord ??????
6. Does anyone else think that this was piss hard and that b3 was much better?
7. (Original post by Macym)
it is okay because it won't have thical problems, since the cord cant form a whole new organism, but it will be rejected.
8. (Original post by hansa123)
you also had to talk about how to make the test valid eg by using quadrats, transects etc.
no you didn't go away
9. Plantains question's answer was 1600, all of my class got this. Also an advantage for hydrogen peroxide question is that is does not require a high temperature
0.25m x 0.25m = 0.0625m^2
0.0625 x 10 = 0.625m^2 (Total area of 10 quadrats)
20 ÷ 0.625 = 32
32 x 5000m^2 = 160000 plantains in total
Is this correct and will it get all the marks?
11. (Original post by funky2722)
it is okay because it won't have thical problems, since the cord cant form a whole new organism, but it will be rejected.
Wasnt the question just: why would using stem cells from the childs umbilical cord not help the childs genetic disorder?
12. (Original post by Yusuf90)
0.25m x 0.25m = 0.0625m^2
0.0625 x 10 = 0.625m^2 (Total area of 10 quadrats)
20 ÷ 0.625 = 32
32 x 5000m^2 = 160000 plantains in total
Is this correct and will it get all the marks?
Thats what i got and number seems reasonable for such a large area
13. (Original post by funky2722)
no you didn't go away
yes you did just because you didnt doesnt mean you have to be a stubborn cow
14. GUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU UUUUUYS

did we have 2 six markers in b2??????????//
15. (Original post by coreHelp)
GUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU UUUUUYS

did we have 2 six markers in b2??????????//
yh think so
16. (Original post by hansa123)
yes you did just because you didnt doesnt mean you have to be a stubborn cow
this is for the photosynthesis 6 mark question right?
17. (Original post by coreHelp)
GUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU UUUUUYS

did we have 2 six markers in b2??????????//
18. (Original post by theholychilli)
Plantains question's answer was 1600, all of my class got this. Also an advantage for hydrogen peroxide question is that is does not require a high temperature
no you probably forgot to divide by 100 becuase converting cm to m is ividing by 10000 not 100.
19. (Original post by funky2722)
yh think so
6 Marker and 5 Marker on Speciation
20. (Original post by YAY GCSE)
Wasnt the question just: why would using stem cells from the childs umbilical cord not help the childs genetic disorder?
Because the DNA coding for the genetic disorder would be present in the umbilical cord cell

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