VCE Biology Exam - 01/11/19 - Discussion/Questions/Solutions

[Sconey]

Yep,couldn't conduct comparative anatomy of a finger and adult tooth ,insufficient information hence without dna analysis the difference between the two species cannot be determined

I answer yes, because of the different locations where the fossils would be found, I think I was wrong though.

I wrote something about the fact that due to BMP4 being expressed less, CaM had more effect on the size and shape of the beaks. Idk im probably wrong thoo 😂

I said that the difference in gene expression results in differently shaped beaks. This means some individuals will have a selective advantage and some a selective disadvantage. Because of this, some survive and reproduce at faster rates than others, and the genotype that expresses the phenotype is passed down through generations with inheritance. Thus, the frequency phenotypes change over time.

I can't remember the exact question but it was more or less that.

Mod edit: merged double post. In future please note that you can quote multiple users in the one post

[3086]

Anyone know what the a+ cut of will be? Or a prediction even

[Genshai]

Anyone know what the a+ cut of will be? Or a prediction even

probably higher than last year.. maybe in the high eighties? but theres really no way to know

[PhoenixxFire]

probably higher than last year.. maybe in the high eighties? but theres really no way to know

It won't go up that much.
The A+ cut off went up 1% from 2017 to 2018 when the A cutoff went up 2%. The A+ normally doesn't change a heap. I'd say at most it would increase by a couple of %.

[_echolab]

I didn't know how to justify why scientists used Nuclear DNA instead of mitochondrial DNA. I bsed it and said that "Mitochondrial DNA is passed down maternally and is highly conserved whereas nuclear DNA contains DNA from both parents which allows scientists to notice evolutionary links in similarities of DNA between Denisovans and Neanderthalensis." (Yeah def not right)

I thought it was the opposite? I wrote that mDNA had no repair mechanisms when mutations occurred and therefore had a fast mutation rate, which made it difficult to measure degree of similarity between two species that had split off a long time ago. By that point in the exam I was basically pulling stuff out of my rear end though so this is probably completely wrong.

[dev_xy]

I wrote something about the fact that due to BMP4 being expressed less, CaM had more effect on the size and shape of the beaks. Idk im probably wrong thoo 😂

I wrote along the lines of...

The mutation of the gene BMP4 results in the changes in the intensity, duration and the times of the gene being expressed during embryonic development. And variation in these factors result in morphological changes, if there is a lot of variation it results in different phenotypic variation.

Phoenix is this right?

the question was question was quite stupid in my opinion.

[Bri MT]

I wrote along the lines of...

The mutation of the gene BMP4 results in the changes in the intensity, duration and the times of the gene being expressed during embryonic development. And variation in these factors result in morphological changes, if there is a lot of variation it results in different phenotypic variation.

Phoenix is this right?

the question was question was quite stupid in my opinion.

I'm not pf & I haven't seen the question but:
- mentioning timing, duration and intensity of gene expression sounds good
- morphological changes are phenotypic by their vary nature

[pugs]

I answer yes, because of the different locations where the fossils would be found, I think I was wrong though.

same i said yes because they were found in europe and eurasia & png lol

[3086]

how do i know what the questions are for multiple choice?

[Jashy]

Anyone know what the a+ cut of will be? Or a prediction even

81% Mate. Confirmed

I thought it was the opposite? I wrote that mDNA had no repair mechanisms when mutations occurred and therefore had a fast mutation rate, which made it difficult to measure degree of similarity between two species that had split off a long time ago. By that point in the exam I was basically pulling stuff out of my rear end though so this is probably completely wrong.

I wrote something similar. It seems right to me

wrote homo sapiens,cant remember what page in the atar notes book states it ,but out of all hominid, homo sapiens do have the largest sized brain
it was trick qn tbh

Ye it was a bit tricky, but the correct answer was Homo Flurosence [/i] or however you spell that. Because it was the only one out of order compared to all other homo species.

how do i know what the questions are for multiple choice?

Its all memory mate

Mod edit: merged quadruple post. In future please note that you can quote multiple users in the one post

[xxxjss]

I wrote something similar. It seems right to me

I bs'ed on how nuclear DNA has more genes than mitochondrial DNA, thus would be more suitable to compare as there would be more differences or similarities to sequence... 

[Sconey]

Ye it was a bit tricky, but the correct answer was Homo Flurosence [/i] or however you spell that. Because it was the only one out of order compared to all other homo species.

I don't know how that could be the answer. The question was referring to brain volume in hominins. H. Sapien doesn't follow the trend because it's brain is smaller than Neanderthals.

[ssillyssnakes]

I bs'ed on how nuclear DNA has more genes than mitochondrial DNA, thus would be more suitable to compare as there would be more differences or similarities to sequence... 

Me too! I'm crazy insecure about that answer though lol...

[alanihale]

I don't know how that could be the answer. The question was referring to brain volume in hominins. H. Sapien doesn't follow the trend because it's brain is smaller than Neanderthals.

homo floresiensis is known to be one of the exceptions to the rules because it's got significantly decreased features (smaller skull, small in general). It doesn't follow the typical pattern.
Homo sapiens may differ slightly but not as much as floresiensis.

.Here's a link my teacher gave us when we were learning about it

[Jashy]

I bs'ed on how nuclear DNA has more genes than mitochondrial DNA, thus would be more suitable to compare as there would be more differences or similarities to sequence... 

Oooo im not sure about the 'more genes'

homo floresiensis is known to be one of the exceptions to the rules because it's got significantly decreased features (smaller skull, small in general). It doesn't follow the typical pattern.
Homo sapiens may differ slightly but not as much as floresiensis.

yes definitely. Agreed

Mod edit: Merged double post. I'm assuming you didn't see my previous merge but please instead quote multiple users within the one post rather than replying twice in a row in future.