2009 Unit 4 exam predictions (Highly advisable)

[kenhung123]

Definately there will be a question in the unit 4 exam explaining how natural selection caused a new species from an example. Such as variation, selection and inheritance.

[qshyrn]

theres a question like this every year.. its an integral part of the study design

[kenhung123]

With that in mind would there be any difference between a question asking to describe the process of natural selection to form new species or speciation process?

[claire.anglim]

This may sound stupid, is this where we use Vissrig? and when we answer it, can we just write down the steps, and then link it to the example given?

[kenhung123]

I think it is best to link it but I mean look at what they expect from assessment report. You can't go wrong with that

[Studyinghard]

most likely there will be a question to read codons to make amino acids.

and meiosis. need to know that like the back of your hand.

[claire.anglim]

I remember going to the Tsfx lecture and the guy going on about meiosis linked with sexual reproduction, and he was like, you MUST know what the sex organs are and how the gametes a fused, ect.

They have a codon to amino acids. I'm hoping for the speciation or allopathic speciation question

[kenhung123]

They have had speciation/allopatric/natural selection (same thing correct me if I'm wrong) for almost all VCAA papers and most trials

[Greggler]

kenhung i wouldnt say speciation and natural selection are the same thing

you could group speciation and allopatric speciation in one...
just have to mention:
- original population splits into two
- isolated in some manner that stops gene flow, this can be geographic isolate (allotropic)
- if two populations were to be re-introduced they would be unable to reproduce and produce fertile offspring

Whereas a natural selection question is focused on these points:
- there is inherent phenotypic variation for  a specific chrachteristic
- a change in selective pressures leads to a struggle for survival, with those with the advantageuos characteristic surviving to reproduce; those without advantageuos phenotype die
- over a period of time, the allele frequency for this advantageous phenotype increases

correct me if im wrong but this is what i thought....

[kenhung123]

Hmmm...but don't different species arise from natural selection?

[mmmmm]

Hmmm...but don't different species arise from natural selection?

Doesn't it just favour a trait, but it doesn't actually give rise to a new species?

[kenhung123]

Right so natural selection is the increase of frequency of some trait and speciation is when there is new species formed

[kenhung123]

kenhung i wouldnt say speciation and natural selection are the same thing

you could group speciation and allopatric speciation in one...
just have to mention:
- original population splits into two
- isolated in some manner that stops gene flow, this can be geographic isolate (allotropic)
- if two populations were to be re-introduced they would be unable to reproduce and produce fertile offspring

Whereas a natural selection question is focused on these points:
- there is inherent phenotypic variation for  a specific chrachteristic
- a change in selective pressures leads to a struggle for survival, with those with the advantageuos characteristic surviving to reproduce; those without advantageuos phenotype die
- over a period of time, the allele frequency for this advantageous phenotype increases

correct me if im wrong but this is what i thought....

Would that gurantee full marks placed in right context?

[Greggler]

kenhung i wouldnt say speciation and natural selection are the same thing

you could group speciation and allopatric speciation in one...
just have to mention:
- original population splits into two
- isolated in some manner that stops gene flow, this can be geographic isolate (allotropic)
- if two populations were to be re-introduced they would be unable to reproduce and produce fertile offspring

Whereas a natural selection question is focused on these points:
- there is inherent phenotypic variation for  a specific chrachteristic
- a change in selective pressures leads to a struggle for survival, with those with the advantageuos characteristic surviving to reproduce; those without advantageuos phenotype die
- over a period of time, the allele frequency for this advantageous phenotype increases

correct me if im wrong but this is what i thought....

Would that gurantee full marks placed in right context?

pretty much, thats just copied off vcaa examiners reports from past exams with those questions