VCE Biology Question Thread

[Gogo14]

does recombination occur at prophase 2 in meiosis?

[Sine]

does recombination occur at prophase 2 in meiosis?

recombination, also known as crossing over occurs during propase I of meiosis.

[blacksanta62]

In the question, it says "hybrid", that's another way of saying hetrozygous. And yellow is also dominant to green, therefore the genotypes would be Gg, Gg. And i assume u know how to do the rest. Answer is B

I realised that (the presence of the word hybrid) after I looked at the question a bit longer. Thank you for the help
I attached a bad question since it had hybrid in the stem, but still, does F₁ crossing involve one homozygous recessive and one homozygous dominant? And then F₂ crossing mean crossing 2 F₁ generations?

VCAA though would never use this term, so don't fret if you haven't heard of it before.
bh I can't recall ever hearing hybrid used in this way either

Okay, I'll stop, lol, but I guess since the SAC is over and done with that this is more about interest

[plsbegentle]

I realised that (the presence of the word hybrid) after I looked at the question a bit longer. Thank you for the help
I attached a bad question since it had hybrid in the stem, but still, does F₁ crossing involve one homozygous recessive and one homozygous dominant? And then F₂ crossing mean crossing 2 F₁ generations? Okay, I'll stop, lol, but I guess since the SAC is over and done with that this is more about interest

Not necessarily, every question will have different background information regarding whether its hetrozgous or pure breed. You can't just assume that its homozygous recessive and homozygous dominant,unless the question specifically states it or evidence provided ( such as offsping %) Also if your interested, F stands for filial which means the offspring of a cross.

[studybuddy7777]

Not necessarily, every question will have different background information regarding whether its hetrozgous or pure breed. You can't just assume that its homozygous recessive and homozygous dominant,unless the question specifically states it or evidence provided ( such as offsping %) Also if your interested, F stands for filial which means the offspring of a cross.

I can certainly ditto the fact that you can't assume whether its dom or recessive, homo or heterozygous (or sex linked or not if you do that, in the HSC you do and im not familiar with VCE)
On a side note i never knew that F stood for Filial meaning the offspring of a cross, maybe something to make me "know what I'm talking about" in the upcoming exam

I agree that some questions are badly written but as we can't do much about them we have to just battle through them..

I just lurk around these forums coz there is a surprising amount of crossover between VCE and HSC

[jennywu890]

1) What is a VCAA accepted definition of a gene?
2) What exactly do we need to know about gene regulation? I'm a bit confused

[Gogo14]

1) What is a VCAA accepted definition of a gene?
2) What exactly do we need to know about gene regulation? I'm a bit confused

1. A region on a DNA which codes for a specific protein
2. Transcription and translation. Also some stuff on post transcription modification

[88mimi12345]

I have a few questions
1) What is post transcription modification and what kind of VCAA questions might be used to test this concept?
2) Where does meiosis fit into the cell cycle?
Thanks everyone ^_^

[plsbegentle]

I have a few questions
1) What is post transcription modification and what kind of VCAA questions might be used to test this concept?
2) Where does meiosis fit into the cell cycle?
Thanks everyone ^_^

1)  So after transcription a thing called pre-mRNA is produced, however it contains non-coding segments called exons. These exons must be removed before it can leave the nucleus, this is post transcription modification. Also a methyl-cap is added to the 5' end and a poly-A tail is added to the 3' end. VCAA questions are pretty easy, they'll most likely ask what occurs in post transcirption modification.
2) What do u mean?

[88mimi12345]

2) I'm referring to the cell cycle with G1->S->G2->M etc. But I was wondering how meiosis would fit in with that whole concept?
Sorry for the confusing phrasing  Thanks though!!

[vox nihili]

1)  So after transcription a thing called pre-mRNA is produced, however it contains non-coding segments called exons. These exons must be removed before it can leave the nucleus, this is post transcription modification. Also a methyl-cap is added to the 5' end and a poly-A tail is added to the 3' end. VCAA questions are pretty easy, they'll most likely ask what occurs in post transcirption modification.
2) What do u mean?

Just to clarify, it's introns that are removed, not exons. This is because:

exons are expressed and introns are in the way

[plsbegentle]

Just to clarify, it's introns that are removed, not exons. This is because:

exons are expressed and introns are in the way

Omfg, so sorry. Yes, introns are the non-coding segments and are removed during post modification. SO SORRY😣

[rimsha_z]

Why hybrids are sterile and which phase of meiosis is affected

[Gogo14]

2) I'm referring to the cell cycle with G1->S->G2->M etc. But I was wondering how meiosis would fit in with that whole concept?
Sorry for the confusing phrasing  Thanks though!!

the cell cycle includes mitosis, but don't think it has meiosis. I think it is separate to the cell cycle.

[vox nihili]

Meiosis is a part of the cell cycle. It occurs during the M-phase