Login

Welcome, Guest. Please login or register.

March 29, 2024, 05:20:47 am

Author Topic: VCE Biology Question Thread  (Read 3570817 times)  Share 

0 Members and 10 Guests are viewing this topic.

katiesaliba

  • Victorian
  • Forum Leader
  • ****
  • Posts: 628
  • Respect: +6
  • School: The University of Melbourne
  • School Grad Year: 2017
Re: VCE Biology Question Thread
« Reply #3195 on: October 05, 2014, 11:31:53 pm »
0
Are QAT exams any good? I'm currently doing one and the questions are either super easy or ridiculously difficult...SURELY we don't have to know what it means by phenome, antigenic shift and something about maintaining blood-brain barriers???  :o (okay the definition of phenome can be deduced, but yeah!)
Bachelor of Science (Immunology major) - The University of Melbourne

katiesaliba

  • Victorian
  • Forum Leader
  • ****
  • Posts: 628
  • Respect: +6
  • School: The University of Melbourne
  • School Grad Year: 2017
Re: VCE Biology Question Thread
« Reply #3196 on: October 05, 2014, 11:41:32 pm »
+1
Aren't they the result of genetic drift? Not sure.

I'm fairly sure that they cause genetic drift, as genetic drift is defined as changes in allele frequencies due to chance.  :)
Bachelor of Science (Immunology major) - The University of Melbourne

RazzMeTazz

  • Victorian
  • Forum Leader
  • ****
  • Posts: 673
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #3197 on: October 05, 2014, 11:43:55 pm »
0
Would it be correct to say that selection pressures also cause changes to allele frequencies in a population?

Also would it be sufficient to just know about these two theories of evolution:
1.) Evolution by natural selection by Charles Darwin and Alfred Wallace
2.) Inheritance of acquired characteristics by Lamarck

??
« Last Edit: October 05, 2014, 11:54:04 pm by RazzMeTazz »

katiesaliba

  • Victorian
  • Forum Leader
  • ****
  • Posts: 628
  • Respect: +6
  • School: The University of Melbourne
  • School Grad Year: 2017
Re: VCE Biology Question Thread
« Reply #3198 on: October 05, 2014, 11:52:05 pm »
0
Would it be correct to say that selection pressures also cause changes to allele frequencies in a population?

Selection pressures act on phenotypes, not genotypes. So yes, in an indirect sense, allele frequencies will change upon exposure to selection pressures (due to selected/unselected traits). However, I would take care with stating a direct relationship between both, unless you mention phenotypes and their associated alleles :)
Bachelor of Science (Immunology major) - The University of Melbourne

katiesaliba

  • Victorian
  • Forum Leader
  • ****
  • Posts: 628
  • Respect: +6
  • School: The University of Melbourne
  • School Grad Year: 2017
Re: VCE Biology Question Thread
« Reply #3199 on: October 06, 2014, 12:01:19 am »
0
why were parabolic jaws and a defined chin selected for in hominin evolution? What advantage do they give? 
Bachelor of Science (Immunology major) - The University of Melbourne

RazzMeTazz

  • Victorian
  • Forum Leader
  • ****
  • Posts: 673
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #3200 on: October 06, 2014, 12:13:28 am »
0
In an attempt to link together the way selection pressures, natural selection, adaptations and evolution are all related would this be correct:

Selection pressures give rise to natural selection. As a result of this, allele frequencies of populations change and thus over time species adapt. This gives rise to evolution. (Charles Darwin and Alfred Wallace theory of evolution anyway..)

katiesaliba

  • Victorian
  • Forum Leader
  • ****
  • Posts: 628
  • Respect: +6
  • School: The University of Melbourne
  • School Grad Year: 2017
Re: VCE Biology Question Thread
« Reply #3201 on: October 06, 2014, 12:22:57 am »
0
In an attempt to link together the way selection pressures, natural selection, adaptations and evolution are all related would this be correct:

Selection pressures give rise to natural selection. As a result of this, allele frequencies of populations change and thus over time species adapt. This gives rise to evolution. (Charles Darwin and Alfred Wallace theory of evolution anyway..)

That's good  :) but you'll need to also address phenotypic variations (as the means for which selection pressures can act on) and inheritance (to increase frequency of favoured traits -and thus their alleles- within the population).
« Last Edit: October 06, 2014, 12:24:28 am by katiesaliba »
Bachelor of Science (Immunology major) - The University of Melbourne

RazzMeTazz

  • Victorian
  • Forum Leader
  • ****
  • Posts: 673
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #3202 on: October 06, 2014, 12:37:29 am »
0
That's good  :) but you'll need to also address phenotypic variations (as the means for which selection pressures can act on) and inheritance (to increase frequency of favoured traits -and thus their alleles- within the population).

Thankyou so much for all the help!

RazzMeTazz

  • Victorian
  • Forum Leader
  • ****
  • Posts: 673
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #3203 on: October 06, 2014, 12:59:01 am »
0
Does anybody know what the characteristics are which define
a.) Hominoids
b.) Hominids

It's on the study design, but I'm afraid to trust other sources since I have heard they often mix the terms hominid, hominoid and hominin up.. Not sure how true that is though. Just wanted to be sure.

Thanks!

millie96

  • Victorian
  • Forum Obsessive
  • ***
  • Posts: 227
  • Respect: +6
Re: VCE Biology Question Thread
« Reply #3204 on: October 06, 2014, 10:53:31 am »
0
Is gene transfer the same as gene therapy?

vox nihili

  • National Moderator
  • Great Wonder of ATAR Notes
  • *****
  • Posts: 5343
  • Respect: +1447
Re: VCE Biology Question Thread
« Reply #3205 on: October 06, 2014, 02:29:32 pm »
+1
Is gene transfer the same as gene therapy?

Gene therapy is an application of gene transfer
2013-15: BBiomed (Biochemistry and Molecular Biology), UniMelb
2016-20: MD, UniMelb
2019-20: MPH, UniMelb
2021-: GDipBiostat, USyd

dankfrank420

  • Victorian
  • Forum Leader
  • ****
  • Posts: 892
  • Respect: +52
Re: VCE Biology Question Thread
« Reply #3206 on: October 06, 2014, 05:34:30 pm »
0
When you're asked to state how many bases would be needed for an amino acid chain, is it always 3x or 3x + 3 (for the stop codon)? Different company papers seem to answer this differently.

RazzMeTazz

  • Victorian
  • Forum Leader
  • ****
  • Posts: 673
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #3207 on: October 06, 2014, 07:32:46 pm »
0
Hominoids: broad term for greater and lesser apes.

Would this be a correct definition?


shivaji

  • Victorian
  • Trendsetter
  • **
  • Posts: 174
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #3208 on: October 06, 2014, 07:38:47 pm »
0
Hominoids: broad term for greater and lesser apes.

Would this be a correct definition?



yes.

hominoids: includes all apes; both the great and lesser apes
hominids: includes all the great apes
hominin: all human species and their bipedal ancestors/relatives


shivaji

  • Victorian
  • Trendsetter
  • **
  • Posts: 174
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #3209 on: October 06, 2014, 07:40:09 pm »
0
can someome give an appropriate definition for index fossil?

i have it is "a fossil which can be used to define and identify geological periods", but i believe that this is not quite good...