AQA Biology B2 Exam

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1 and 2. Only one dominant allele needed to express characteristic. Two recessive needed to express that characteristic. I think?

Yea, that's for one chromosome, i think it was referring to all of them in the cell, so for each and every chromosome there would be that 1 dominant allele, adding up to 23 total>

Reply 101

CriminalCosta

Original post by isabellagrace

I put one reason as major geological disasters destroy them like asteroids or earthquakes but I didn't know a second point, so I said about soft bodied organisms that decay completely so we don't have any fossils of them even though it was about birds not slugs or whatever :frown:

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Doesn't matter, don't worry. It was a general question that one not specific to birds

Reply 102

LydiaSwift

what did people get for the ratio question ???

Reply 103

ellen199

apparently there was a question on meiosis or mitosis for one mark.. i don't remember this! scared i have accidentally missed a page out

Reply 104

User23

Original post by Jamesosborne

Tbf my stupid instincts lead me into writing 750 for the magnification ! Don't know where I got that from ! So I can't help on that one sorry - why are there gaps in the fossil reocrd ?

Gaps due to most scientists believed that organisms back then were soft bodied and tend to decay also fossils that had already formed crushed due to tectonic plates

Reply 105

ellen199

Original post by LydiaSwift

what did people get for the ratio question ???

I got 3:1 (purple:white) I think it meant like guess cos you couldn't simplify

Reply 106

LydiaSwift

Original post by ellen199

I got 3:1 (purple:white) I think it meant like guess cos you couldn't simplify

Oh OK thanks I feel like I completely failed :frown:

I put like 7:2 or something !
Thanks anyway though.

Reply 107

qwerzxcv1234569

what did you all do for the ratio question??/

Reply 108

qwerzxcv1234569

Original post by ellen199

I got 3:1 (purple:white) I think it meant like guess cos you couldn't simplify

did you work that out or guess?

Reply 109

qwerzxcv1234569

Original post by LydiaSwift

Oh OK thanks I feel like I completely failed :frown:

I put like 7:2 or something !
Thanks anyway though.

I put 15:4 but I guess if I simplified it I would've got something near 3:1

Reply 110

Camerxn

Hey, haven't been on in ages.
I had my 2 French exams to day morning, and my B2 and B3 exam as well.
Both exams were very easy for me, I believe I have guaranteed myself 45+ marks on both papers.
B2 was much easier than B3.

Reply 111

Camerxn

Original post by qwerzxcv1234569

did you work that out or guess?

It was 3:1

Reply 112

Styster99

Original post by qwerzxcv1234569

what did you all do for the ratio question??/

3:1

Reply 113

Camerxn

By the way the magnification should have given you 400. I put 40 :frown:

Reply 114

Camerxn

Original post by Smingle

0.1mm (scale) = 4cm

4cm = 40mm

40/0.1 = 400

Anyone else get this for magnification?

Got 40 unfortunately, it was 400 after my friend explained it

1 and 2

Original post by b_i

i got 1 and 2 as well

same.... Had to think about it !
I ran out of time so was writing junk towards the end :frown:

Reply 117

niamhroisin

I thought it was super unfair giving us that QWC like come on, we've already done our ISA!

I put 1 & 2 for the alleles one but also got 40 for magnification, did I mess up? I was having a calculator issue at that point anyway which wasn't fun :frown:

And the milk and bile question was awful ahhh. Anyway, I thought B3 was beautiful in comparison!