# EdExel Biology Unit 5Watch

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Poll: I think
I got an A (22)
25%
I got a mid B (18)
20.45%
I got a B (10)
11.36%
I got a high C (13)
14.77%
I got below a C (25)
28.41%
11 years ago
#221
could you please show your working, i got 1:4, for the jan 06 one by the way
thanks
0
11 years ago
#222
(Original post by gorilla_baby)
OMG!! it was my mistake, sorry, damn i knew the answer but for some reason i wrote 50%, but hey if i say in the answer 1:4, but then say prob = 1/4 +1/4 = 1/2, do you think i get the mark, or out of 5 marks (i did the diagram correctly btw), how much would i get? thanks
The probability doesnt change because they had one child with the disease. There is still a 1 in 4 chance the next child will have the disease as the parental genotypes remain the same
0
11 years ago
#223
And actually that january06 paper supports the answer that we got too(1/4).

Work it out and you'll find that the probability that a child inherits sickle cell anaemia is 0.5, so, the probability of a child inheriting the disease in the future is still 0.5, they're the same.
0
11 years ago
#224
(Original post by ps7)
so is 1 in 4 the ryt ansa?
Yeh thats the only thing im sure about on the whole paper lol
0
11 years ago
#225
i wrote about active and non active site directed inhibitors, enzyme cannot catalyse the reaction so conversion doesn't happen
0
11 years ago
#226
Ok so on the genetic cross I didn't do R's for the alleles, will I still get marks? I don't know why but I used Vn for normal vision and Vp for pigmentosa. I mentioned that the parents were heterozygous etc and did this test cross:

Gametes Parent 1: Vn Vp
Gametes Parent 2: Vn Vp
so offspring: VnVn, VnVp, VnVp, VpVp, and so theres a 0.25 probability that there child with be a sufferer.

What do you think?
0
11 years ago
#227
yeh i used Nn x Nn for mine nn being diseased
0
11 years ago
#228
The alphabet that you chose to use doesn't matter as long as you indicate it. I used A and a, but i wrote under those alphabets the meaning of it. For example, under A(i wrote dominant) and under a i wrote recessive. I think the examiner wouldn't be that stupid not to know it...
0
11 years ago
#229
ANYONE DID 5H???? Wot did you write for the amino acid being replaced and asked if this changing affect the action of insulin????
0
11 years ago
#230
That question was in 5B too..
0
Thread starter 11 years ago
#231
(Original post by DRUBERT)
yeh i used Nn x Nn for mine nn being diseased
LMAO i used the exact same letters and got 25% too.
0
11 years ago
#232
yea what did u guys write for that insulin question?
0
11 years ago
#233
that particular amino acid was the one which disulphide bonds occured between
so without the disulphide bonds the insuin was active
so active insulin promotes glycogenesis
therefore lower bgl conc
0
11 years ago
#234
Did anyone use A and a? Or am i the only one?
0
11 years ago
#235
(Original post by tami*)
that particular amino acid was the one which disulphide bonds occured between
so without the disulphide bonds the insuin was active
so active insulin promotes glycogenesis
therefore lower bgl conc
aint u sopposed to mention stuff like point mutations?
0
11 years ago
#236
i really doubt it matters
i used R and r
0
11 years ago
#237
(Original post by M.A.H)
aint u sopposed to mention stuff like point mutations?
yeah that too..but i didn't elaborate on that bit too much oopsy
0
11 years ago
#238
(Original post by ~Adel~)
Did anyone use A and a? Or am i the only one?
I think i used Aa and as mos def said u can use SEX and sex if u wanted
0
11 years ago
#239
Yeah..but i wouldn't like to put 5 precious marks at risk even though i know it's theoretically right. ^^
0
11 years ago
#240
does a carrier mean that it will have a disease, regardless of it being homozygous recessive?
0
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