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March 29, 2024, 09:12:45 pm

Author Topic: VCE Biology Question Thread  (Read 3571587 times)  Share 

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dankfrank420

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Re: VCE Biology Question Thread
« Reply #2805 on: September 15, 2014, 07:05:07 pm »
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Is there a difference between migration and gene flow?

Migration is a cause of gene flow.

In protein synthesis, do the START and STOP codons cause an amino acid to join the chain? Eg. If I had START xxx xxx xxx STOP would 5 or 3 amino acids be on the chain?

psyxwar

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Re: VCE Biology Question Thread
« Reply #2806 on: September 15, 2014, 07:07:17 pm »
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Migration is a cause of gene flow.

In protein synthesis, do the START and STOP codons cause an amino acid to join the chain? Eg. If I had START xxx xxx xxx STOP would 5 or 3 amino acids be on the chain?
The start codon (AUG) codes for methionine, which is an amino acid that would be added to the chain. Stop codons don't code for any amino acids and merely signal the termination of translation
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dankfrank420

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Re: VCE Biology Question Thread
« Reply #2807 on: September 15, 2014, 07:17:51 pm »
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The start codon (AUG) codes for methionine, which is an amino acid that would be added to the chain. Stop codons don't code for any amino acids and merely signal the termination of translation

Ah, so just to confirm that in my example it would be a 4 amino acid long polypeptide?

psyxwar

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Re: VCE Biology Question Thread
« Reply #2808 on: September 15, 2014, 07:24:12 pm »
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Ah, so just to confirm that in my example it would be a 4 amino acid long polypeptide?
Yeah. UAA, UGA, UAG are the stop codons if you're interested. Pretty easy to memorise ('u r annoying', 'u go away', 'u r gone', courtesy of TSFX).
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RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #2809 on: September 15, 2014, 07:32:56 pm »
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How would you define bottleneck effect and founder effect?

Thanks.

walkec

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Re: VCE Biology Question Thread
« Reply #2810 on: September 15, 2014, 08:23:36 pm »
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Call me an idiot but do prions have a cell wall or not?

I have gaps in my Unit 3 notes - haaaaalllpppp meeeee

melons

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Re: VCE Biology Question Thread
« Reply #2811 on: September 15, 2014, 08:25:18 pm »
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How would you define bottleneck effect and founder effect?

Thanks.

Bottleneck effect is a decrease in genetic diversity due to a chance event.
Founder effect is when a small, unrepresentative sample leaves a parent population to colonise a new habitat.

Call me an idiot but do prions have a cell wall or not?

I have gaps in my Unit 3 notes - haaaaalllpppp meeeee

No. Prions are abnormal, infection proteins so are just a polypeptide chain.
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Jazza12396

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Re: VCE Biology Question Thread
« Reply #2812 on: September 15, 2014, 10:50:07 pm »
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does biological evolution have to be caused by natural selection or can it be caused by another factor (such as selective breeding) which causes a change in the gene pool?

Scooby

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Re: VCE Biology Question Thread
« Reply #2813 on: September 15, 2014, 10:52:11 pm »
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does biological evolution have to be caused by natural selection or can it be caused by another factor (such as selective breeding) which causes a change in the gene pool?

Selection (including natural and artificial/selective breeding), gene flow, genetic drift, etc, are all mechanisms of biological evolution
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Jazza12396

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Re: VCE Biology Question Thread
« Reply #2814 on: September 15, 2014, 11:04:07 pm »
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Thanks! The notes my teacher gave us only said Natural selection in the definition which is what confused me.

RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #2815 on: September 16, 2014, 09:06:30 pm »
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What is the difference between a phylogenetic tree and a cladogram?
« Last Edit: September 16, 2014, 09:09:09 pm by RazzMeTazz »

anat0my

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Re: VCE Biology Question Thread
« Reply #2816 on: September 16, 2014, 11:26:24 pm »
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What is the difference between a phylogenetic tree and a cladogram?

I think they're the same thing?

anat0my

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Re: VCE Biology Question Thread
« Reply #2817 on: September 16, 2014, 11:27:12 pm »
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Can someone please explain linked and unlinked genes? :)

dankfrank420

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Re: VCE Biology Question Thread
« Reply #2818 on: September 16, 2014, 11:48:23 pm »
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Can someone please explain linked and unlinked genes? :)

Linked genes are on same chromosome, so are more likely to be inherited together.

dankfrank420

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Re: VCE Biology Question Thread
« Reply #2819 on: September 16, 2014, 11:49:11 pm »
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Can someone please tell me some ethics to do with artificial selection/captive breeding and gene therapy?