VCE Biology Question Thread

[Jason12]

does DNA replication occur in Synthesis or Gap 2 phase of cell cycle? Also does interphase cover G1,S and G2 phases before meiosis?

[vox nihili]

does DNA replication occur in Synthesis or Gap 2 phase of cell cycle? Also does interphase cover G1,S and G2 phases before meiosis?

S

yes

[Jason12]

what is n, 2n and 4n in meiosis?

[dankfrank420]

what is n, 2n and 4n in meiosis?

Cell duplicates it's contents before undergoing Meiosis I, so it is 4n

After meiosis I is complete, there are two 2n cells

After meiosis II is complete, there are four n cells

1 cell x 4n ---> 2 cells x 2n ---> 4 cells x n

[alchemy]

what is n, 2n and 4n in meiosis?

n represents 23 chromosomes.

[Scooby]

Cell duplicates it's contents before undergoing Meiosis I, so it is 4n

After meiosis I is complete, there are two 2n cells

After meiosis II is complete, there are four n cells

1 cell x 4n ---> 2 cells x 2n ---> 4 cells x n

The two cells that result from meiosis I are haploid (n), not diploid (2n). They each have 46 chromatids all up but only 23 chromosomes (each chromosome consists of two chromatids). None of the cells involved are ever tetraploid (4n)

[dankfrank420]

The two cells that result from meiosis I are haploid (n), not diploid (2n). They each have 46 chromatids all up but only 23 chromosomes (each chromosome consists of two chromatids). None of the cells involved are ever tetraploid (4n)

Wait, so does that mean that at the end of meiosis I the cells duplicate their chromosomes again?

[vox nihili]

Wait, so does that mean that at the end of meiosis I the cells duplicate their chromosomes again?

Nope, they don't reduplicate.


A cell that undergoes meiosis I: H H (two copies of two chromatid chromosomes)

A cell that undergoes meiosis II: H (one copy of two chromatid chromosome)

Gamete: I (one copy of one chromatid chromosome)

[sparkyblossom]

Question: Is a stalked particle the same as a cytochrome? And also which one is more accepted in the exam?

Thanks 

[vox nihili]

Question: Is a stalked particle the same as a cytochrome? And also which one is more accepted in the exam?

Thanks 

You're not going to get asked about either of these things. I'm second year uni and I still couldn't tell you what you're talking about there...

[Reus]

How in depth do we need to know GMOs and other gene manipulation??

[vox nihili]

How in depth do we need to know GMOs and other gene manipulation??

You need to know how gene insertion works pretty well. So all the ins and outs of a restriction digest and the involvement of PCR and gel electrophoresis in that process. Otherwise you don't need to know all that much. A little bit about cloning. What a GMO is.

[Reus]

Thanks

[Reus]

Why are sticky ends more desirable than blunt ends?
Ty. 

[RazzMeTazz]

Are germ-line cells the same as germ cells?