swag_sxc_boi's Bio 3/4 question thread

[swagsxcboi]

Ahhh, I was just perplexed at that lol. Makes sense though - but even so, I mean its weird to distinguish the two. I mean, like both are ways of intervening in evolution, but it would probably be more suitable to distinguish for instance transgenic organisms and genetically-modified organisms, and then distinguish selective breeding from natural selection. I would cry if such a question came up LOL

We had to do the 2013 STAV paper under exam conditions at school and I think the exact same question came up
"What is the difference between gene therapy and selective breeding?" or something like that haha
I guess they're trying to see if we understand that selective breeding is in a way more 'natural' than gene therapy (or something like that hahah)

[Yacoubb]

We had to do the 2013 STAV paper under exam conditions at school and I think the exact same question came up
"What is the difference between gene therapy and selective breeding?" or something like that haha
I guess they're trying to see if we understand that selective breeding is in a way more 'natural' than gene therapy (or something like that hahah)

Oh wow.. I'd actually be dumbfounded getting a question like that lol. I'd probably just mention that gene therapy is a therapeutic mechanism that is in the favour of the organism, whereas selective breeding may not necessarily be in the favour of organisms, because the desired traits that humans select for may not necessarily confer a survival advantage in the wild.

[swagsxcboi]

Oh wow.. I'd actually be dumbfounded getting a question like that lol. I'd probably just mention that gene therapy is a therapeutic mechanism that is in the favour of the organism, whereas selective breeding may not necessarily be in the favour of organisms, because the desired traits that humans select for may not necessarily confer a survival advantage in the wild.

Yeah I think that's sufficient.
haven't got the trial back yet but i'll confirm once I do

[Yacoubb]

Yeah I think that's sufficient.
haven't got the trial back yet but i'll confirm once I do

Cheers

[Irving4Prez]

Okay where did you find this question?.. This is kinda strange. It's like asking the difference between a protein and a reflex arc. They're not exactly in the scope where you could ask for a difference.

Haha, my thoughts exactly. Such an ambiguously odd question but it popped up on SAC 5 of Unit 4 and I wasn't too sure how to answer it

[Yacoubb]

Haha, my thoughts exactly. Such an ambiguously odd question but it popped up on SAC 5 of Unit 4 and I wasn't too sure how to answer it

It just doesn't sound like something you'd ever be asked to compare. I mean, you could, but it'd be as stupid as comparing a reflex arc with a protein. My SAC 5 is going to be on 3 article excerpts, which we have to answer questions in relation to. Cannot wait to finish my final SAC!

[Irving4Prez]

My SAC 5 is going to be on 3 article excerpts, which we have to answer questions in relation to. Cannot wait to finish my final SAC!

Thought we were the only ones who hadn't finished all their SACs We just finished the syllabus. Good luck!

[Yacoubb]

Thought we were the only ones who hadn't finished all their SACs We just finished the syllabus. Good luck!

I finished the syllabus last term Thanks!

[swagsxcboi]

Thought we were the only ones who hadn't finished all their SACs We just finished the syllabus. Good luck!

LOL we haven't finished the syllabus... and we had to do our evolutionary relationships SAC (last week) before we were taught anything about it...
and this week we have to do our final sac (human intervention) and I doubt we'll even cover it in class...

[Irving4Prez]

LOL we haven't finished the syllabus... and we had to do our evolutionary relationships SAC (last week) before we were taught anything about it...
and this week we have to do our final sac (human intervention) and I doubt we'll even cover it in class...

Wow, I thought we were behind My mates told me all your Unit 3 SACs were from the internet, so at least you have that as a back fall!

And another weird question, how does genetically modified crops influence cultural evolution?

[swagsxcboi]

Wow, I thought we were behind My mates told me all your Unit 3 SACs were from the internet, so at least you have that as a back fall!

And another weird question, how does genetically modified crops influence cultural evolution?

well yeah but when everyone has the sac, it isn't exactly much of an advantage, more of a disadvantage.

[swagsxcboi]

It just doesn't sound like something you'd ever be asked to compare. I mean, you could, but it'd be as stupid as comparing a reflex arc with a protein. My SAC 5 is going to be on 3 article excerpts, which we have to answer questions in relation to. Cannot wait to finish my final SAC!

The fruit papaya, or pawpaw, are susceptible to a virus called ringspot virus that threatens the commercial production of papaya. Research scientists have inserted a single gene that encodes for the production of the protein coat of the virus. The expression of this gene protects the papaya from infection by the virus.

Explain the difference between selective breeding of a virus resistant papaya and the genetic engineering described above.
Selective breeding refers to artificial selection and genetic engineering of the papaya refers to transfection. Selective breeding is breeding individuals with desirable traits (by humans), as opposed to genetic engineering which is introducing a foreign gene into the organisms genome.
I got 1 mark of out 2 marks, probably because I didn't mention the virus resistant papaya.

[Yacoubb]

The fruit papaya, or pawpaw, are susceptible to a virus called ringspot virus that threatens the commercial production of papaya. Research scientists have inserted a single gene that encodes for the production of the protein coat of the virus. The expression of this gene protects the papaya from infection by the virus.

Explain the difference between selective breeding of a virus resistant papaya and the genetic engineering described above.
Selective breeding refers to artificial selection and genetic engineering of the papaya refers to transfection. Selective breeding is breeding individuals with desirable traits (by humans), as opposed to genetic engineering which is introducing a foreign gene into the organisms genome.
I got 1 mark of out 2 marks, probably because I didn't mention the virus resistant papaya.

Yeah this is a good question. My approach:

Selective breeding would involve farmers selecting papaya with ringspot virus resistance to survive, reproduce and make contributions to the gene pool of successive generations, whereas genetic engineering would involve the transfection of the papaya cells with the ringspot virus resistance gene.

[Snorlax]

Question about Apoptosis:

How would you guys explain it in terms of signal transduction?
Also, what are some extrinsic causes of apoptosis? (does extrinsic include mutations etc? or is that intrinsic)

Thanks.

[Yacoubb]

Question about Apoptosis:

How would you guys explain it in terms of signal transduction?
Also, what are some extrinsic causes of apoptosis? (does extrinsic include mutations etc? or is that intrinsic)

Thanks.

It involves the receipt of a signal by the cell that needs to be apoptised, and the activation of several molecules (e.g. caspase enzymes) that finally leads to the response made by the cell to self-destruct.

That follows the signal transduction model:
Receipt of a signal --> several molecules activated --> Response made by the cell.

Extrinsic causes:
- Too many of that particular type of cell exist
- The cell is no longer required
- The cell has completed its cycle.

Intrinsic causes:
- DNA has been damaged (i.e. mutations, etc).
- A cell has been infected by a pathogen