After the EXAM (feedback)

[username]

Anyone know the correct answer to the DNA graph? You had to plot B and D or something.

[JL_91]

By 'they can no longer be masked', I mean that because ONE of the genes has moved to another chromosome, the other one is left without a 'partner' allele. Therefore whichever allele that remaining one is, is the one that is going to be expressed in the person's phenotype. It cannot be masked by, say, a dominant, healthy version of that gene. So if this remaining allele is defective - well, the person's health is adversely affected.

[puffy]

That exam was amazing! I loved it! I think I did better on it than the mid year and I got an A+ on that so.. YAY! and I thought the cell cycle question was very straight forward and the 3 factors I put were:

- Parents medical records
- Also we could test the offspring and when we do we must look at BOTH parents, not just the sailor
- Look at the frequency of the problems the sailors are having and compare with the general population

YAY no more biology!

[bucket]

Anyone know the correct answer to the DNA graph? You had to plot B and D or something.

I put B at 4 as there had been DNA synthesis and D at 2 because it was after cell division but before DNA synthesis.

[Faraz]

yep bucket I picked that up to but I just put A


I did the graph on as so



2x ------> 1 -------> 2x some people went to 4x which didnt make sense to me I didnt see how it worked 4/2 and 2/1 are the same thing in my opinion

[bucket]

Yeah it was in arbitrary units anyway, so anything showing that ratio should be correct. They didn't say whether the organism was diploid or haploid .

And yeah in that multi choice i just chose A :S

[lacoste]

wait guys,

what was the answer to the ABO blood group qst, dont know i think 3 and part. dont know....

it was the qst with the like: what would the blood group of _____?? one mark qst.

[Faraz]

ummm I cant remember but I think its was

I(b)i

and I(a)I(b)




I wasnt sure bot the hh I(a)I(b)

I wasnt sure cause was it just asking what it would be since we new hh didnt express it so yeah Im confused...

[puffy]

Does anybody have any suggested solutions yet? Or even the exam to upload?

[bucket]

the blood group off hhI^AI^B?

I put blood type B as the diagram before it showed that the H allele coded for a substrate that was involved in the production of the A antigen, so lack of the H allele meant that A antigen would not be produced.

[username]

wait guys,

what was the answer to the ABO blood group qst, dont know i think 3 and part. dont know....

it was the qst with the like: what would the blood group of _____?? one mark qst.

I said blood group B because hhIAIB would not have produced the A antigen or something. It's probably wrong though. I didn't write the genotype either, since it didn't ask for it specifically.

[Faraz]

I cant remember much but didnt just say that hh didnt express for example such and such.. not hh doesnt express A?


I dunno cause it just asked for the blood group if I remember correctly maybe the hh was just there to confuse not sure. 

[JL_91]

I checked that blood group question with my teacher. The correct answer is, hhIAIB produces blood group O, because without the dominant H allele, no blood antigens are made. H is the substrate for the production of these antigens, as the question stated. In that little flow diagram thing, they just used IA as an example representative of both antigens. You had to read what they actually wrote about the function of the H substrate, before that diagram.

[bucket]

I have the exam with me.
The exact words are:
"H substance is the substrate for the production of the antigens associated with the ABO blood group."
then it has the diagram:
H substance  --------------(presence of I^A allele)-------------->A antigen is produced.

It clearly shows that without the H substance (ie. hh genotype), the A antigens cannot be produced.

edit* hmm, what your teacher says does make sense.

[domaap]

I didn't mind this years exam. Was easier than I expected but trial exams always seem to be harder but yes, I agree with most people. That bomb question really was a killer