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March 29, 2024, 04:11:32 am

Author Topic: VCE Biology Question Thread  (Read 3570739 times)  Share 

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Sine

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Re: VCE Biology Question Thread
« Reply #12705 on: July 01, 2020, 03:13:00 pm »
+3
How would you answer this question/ what would you need to include for 4 marks.
Using examples explain why sex linkage and co-dominance do not produce simple Mendelian ratios
Just guessing on the mark scheme but I would go with
1 mark - definition/explanation of what mendelian ratios are
2 marks - explanation
1 mark - including an example

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #12706 on: July 01, 2020, 03:53:20 pm »
0
would this be correctly labelled

Sine

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Re: VCE Biology Question Thread
« Reply #12707 on: July 01, 2020, 04:13:16 pm »
+4
would this be correctly labelled
Some of it is a bit unclear as to what the labels are pointing exactly to but you seem to have labelled in the generally correct areas.
Some potential fixes would be that the IVC and SVC both drain to the right atrium (but don't really come together themselves).

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #12708 on: July 01, 2020, 04:39:49 pm »
0
Does the X chromosome undergo crossing over

Owlbird83

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Re: VCE Biology Question Thread
« Reply #12709 on: July 01, 2020, 07:02:22 pm »
+1
Does the X chromosome undergo crossing over

Crossing over occurs normally between x-chromosomes. When there's x and y it only occurs in a small place called the pseudoautosomal region that is like an autosomal part and are homologous between the x and y.
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Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #12710 on: July 01, 2020, 10:37:32 pm »
+1
Thanks!

Does non random mating introduce variation into a population

What’s Telocentric and metacentric chromosomes?

Azila2004

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Re: VCE Biology Question Thread
« Reply #12711 on: July 01, 2020, 10:48:58 pm »
+1
Hello!

I have a question: For example, when describing some of the reasons for apoptosis and other things, why do you always have to write viral infection rather an infection through protozoa or such? I understand you have to be specific, but why specifically viral infections? I saw in VCAA answers that only viral infections are included.

Thanks :)
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Owlbird83

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Re: VCE Biology Question Thread
« Reply #12712 on: July 01, 2020, 10:57:52 pm »
+4
Thanks!

Does non random mating introduce variation into a population

What’s Telocentric and metacentric chromosomes?
It can both increase and decrease variation.
For example, when animals choose to mate with other animals who are similar to them, it decreases variation, but when the species tends to mate with others who are more different from them, then it leads to more variation.
( I'm pretty sure it's mostly decreasing variation though, because when like colourful male birds are more attractive to the females, after generations, most of the male birds then end up colourful because they are picked to mate with).
Edit: I might be wrong, I think it might only decrease genetic variation
Edit2: I just went to bed and started thinking about it, and non random mating would decrease variation, it wouldn't increase it. (correct me if I'm wrong anyone)

Telocentric chromosomes have their centromeres at the end of the chromosomes, metacentric chromosomes have the centromere at the centre of the chromosomes.
« Last Edit: July 01, 2020, 11:19:56 pm by Owlbird83 »
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1729

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Re: VCE Biology Question Thread
« Reply #12713 on: July 02, 2020, 09:59:02 am »
+6
Thanks!

Does non random mating introduce variation into a population

What’s Telocentric and metacentric chromosomes?
I don't think you should be asking googleable questions here such as your last question and in regards to your first question it kind of depends by selecting (for example) for individuals with similar genotypes, you can end up with inbreeding which results in a narrower gene pool however by selecting for individuals with different genotypes (this is fittingly called outbreeding) you can actually increase the variation of the gene pool, introducing greater genetic variation among the population. And Non random mating (correct me if im wrong) will still show variation as there will be allelic recombination within gametes, however keep in mind (correct me if im wrong) that genetic variation from recombination has a much lesser impact than inbreeding/outbreeding.
Edit: I might be wrong, I think it might only decrease genetic variation
Edit2: I just went to bed and started thinking about it, and non random mating would decrease variation, it wouldn't increase it. (correct me if I'm wrong anyone)
It depends on what sort of non-random mating inbreeding vs outbreeding.

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #12714 on: July 02, 2020, 02:08:21 pm »
+1
Ok thanks

Why can’t 33 electrons be produced in the electron transport chain

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Re: VCE Biology Question Thread
« Reply #12715 on: July 02, 2020, 07:06:47 pm »
+3
Why can’t 33 electrons be produced in the electron transport chain
ETC is a transport chain I don't think it produces any electrons and I also don't think it had a limit but it does cap when there's no oxygen. Excited electrons pass through the ETC (going crazy and then losing its energy), but if I recall correctly, the ETC doesnt produce any of its own.

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Re: VCE Biology Question Thread
« Reply #12716 on: July 02, 2020, 07:55:33 pm »
+9
Does non random mating introduce variation into a population

I think this is a very broad question which is hard to give a quick answer to but my short answer is: probably not in general since you said "introduce"

Heads up going that I'm going well and truly outside the study design here:

One aspect of genetic variation is heterozygosity which is influenced by non-random mating but in this case you'd already have heterozygosity present (just at a different level) under random mating (e.g. under HW equilibrium) - it wouldn't be introduced by it.

There is the argument that that outbreeding or disassortative mating would increase allelic diversity (which is positively correlated with heterozygosity) by increasing probability of reproduction with organisms from other populations. Imo, this would only introduce variation if you had an organism leaving, mating in another population with unique alleles, then producing offspring back in the original population.

Others have alluded above that assortative mating or inbreeding (these are different but similar terms) would decrease genetic diversity whereas the opposites would increase it. This is true but may not be reflected in all measures of genetic diversity and is also influenced by metapopulation dynamics. For example, if looking at Wright's F statistics \(F_{IS}\) reflects how random mating is whereas \(F_{ST}\) reflects variation between subpopulations & if looking at an isolated population with no dispersal things will be different than if looking at a stepping stone type metapopulation structure.

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #12717 on: July 02, 2020, 10:47:00 pm »
+1
How are homologous chromosomes randomly assorted into the two daughter cells resulting from meiosis 1

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Re: VCE Biology Question Thread
« Reply #12718 on: July 03, 2020, 09:45:20 am »
+6
How are homologous chromosomes randomly assorted into the two daughter cells resulting from meiosis 1
Thats what recombination is:
---A---B---C---
---a---b---c---
Imagine this arrangement of alleles recombination would do this:
---a---B---C---
---A---b---c---
This could happen to any allele switching the position of alleles leads to random assortment alleles are 'independent' in this sense. Does that make sense? Please correct me if I'm wrong because I'm rusty on this stuff.

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #12719 on: July 03, 2020, 11:28:19 am »
+1
No I don’t understand it