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March 29, 2024, 08:20:05 am

Author Topic: VCE Biology Question Thread  (Read 3570958 times)  Share 

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nerdmmb

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Re: VCE Biology Question Thread
« Reply #2355 on: July 24, 2014, 07:26:20 pm »
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Why do chromosomes shorten and condense during prophase?

Does this also occur in meiotic prophase I and prophase II?

Thanks!
« Last Edit: July 24, 2014, 08:44:57 pm by nerdmmb »

Micheal Jackson

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Re: VCE Biology Question Thread
« Reply #2356 on: July 24, 2014, 08:00:48 pm »
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Has anyone got recommendations for some good practice exams? I've done some company one and see a few errors now and then :( (especially for BIO) I reckon checkpoint is the best but it would be great if you guys can recommend me some reputable companies or other resources? Thanks heaps :D!

The checkpoints qs are from VCAA exams, so VCAA exams are the best to do. I also did Lisachem papers, neap and stav ones as well. You can find free papers at the engage education website, but they are not always up to date.

grannysmith

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Re: VCE Biology Question Thread
« Reply #2357 on: July 24, 2014, 08:18:07 pm »
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Why do chromosomes shorten and condense during prophase?

Does this also occur in meiotic prophase I and prophase II?

Thanks?
Probably so homologous chromosomes can separate more easily. I don't think it condenses again during prophase II.. not sure

Scooby

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Re: VCE Biology Question Thread
« Reply #2358 on: July 24, 2014, 08:58:44 pm »
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Why do chromosomes shorten and condense during prophase?

Does this also occur in meiotic prophase I and prophase II?

Thanks!

The chromatin needs to condense so that the chromosomes can segregate appropriately - imagine how hard that'd be if it weren't condensed, with DNA basically just scattered throughout the nucleus. And yeah, it occurs in both prophase I and II (the chromatin unwinds during telophase I)
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nerdmmb

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Re: VCE Biology Question Thread
« Reply #2359 on: July 24, 2014, 09:27:39 pm »
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Is it correct to say that crossing over occurs in synapsis?

Also, what is the purpose of recombinant DNA?

Thanks!

Reus

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Re: VCE Biology Question Thread
« Reply #2360 on: July 24, 2014, 09:42:01 pm »
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Is it correct to say that crossing over occurs in synapsis?
Yes.

Also, what is the purpose of recombinant DNA?
To manipulate genes (kind of generic as it has several purposes)
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alchemy

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Re: VCE Biology Question Thread
« Reply #2361 on: July 24, 2014, 09:53:25 pm »
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Explain how linkage decreases the amount of genetic variation in the offspring?

nerdmmb

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Re: VCE Biology Question Thread
« Reply #2362 on: July 24, 2014, 10:00:24 pm »
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Explain how linkage decreases the amount of genetic variation in the offspring?

I'll try to answer this one as best as I can :)

Since linkage occurs as a result of genes being located very close to each other on a chromosome, the chances of one or more of the linked genes undergoing crossover is minimum. This results in a decreased amount of genetic variation in offspring.
« Last Edit: July 25, 2014, 12:28:42 pm by nerdmmb »

alchemy

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Re: VCE Biology Question Thread
« Reply #2363 on: July 24, 2014, 10:01:56 pm »
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I'll try to answer this one as best as I can :)

Since linkage is a result of genes being located very close to each other on a chromosome, the chances of one or more of the linked genes undergoing crossover is minimum. This results in a deceased amount of genetic variation in offspring.

Yeah that's what I wrote but I'm not sure of the answer after reading this http://biology-forums.com/index.php?topic=89073.0

katiesaliba

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Re: VCE Biology Question Thread
« Reply #2364 on: July 24, 2014, 10:07:29 pm »
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Try to draw out a few cycles, putting the primers in the same spot. Assume that taq pol copies all the way to the end. Sure, I could explain it, but this is a nice one to nut out for yourself.

So, can I correctly assume that taq polymerase just breaks off because of the primer?
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vox nihili

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Re: VCE Biology Question Thread
« Reply #2365 on: July 24, 2014, 10:17:45 pm »
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So, can I correctly assume that taq polymerase just breaks off because of the primer?

No
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nerdmmb

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Re: VCE Biology Question Thread
« Reply #2366 on: July 24, 2014, 10:26:05 pm »
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Yeah that's what I wrote but I'm not sure of the answer after reading this http://biology-forums.com/index.php?topic=89073.0

Hmm... You're right, they've gone into a lot of detail and Mendels Laws are in AOS2 if I'm not mistaken so I guess we'd understand better once we've covered that :)

katiesaliba

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Re: VCE Biology Question Thread
« Reply #2367 on: July 24, 2014, 10:40:18 pm »
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Re: VCE Biology Question Thread
« Reply #2368 on: July 24, 2014, 11:33:55 pm »
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Can someone please explain the term Pleiotropy? Thanks!

nerdmmb

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Re: VCE Biology Question Thread
« Reply #2369 on: July 25, 2014, 12:29:53 pm »
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Since plant cells lack centrioles, what pulls chromosomes apart during mitosis?

Thanks!