VCE Biology Question Thread

[RazzMeTazz]

Can mitosis be used as a form of asexual reproduction in some organisms?

[RazzMeTazz]

Would it be sufficient to say that the purpose of meiosis is: To produce genetically different haploid gametes from diploid germ cells, for sexual reproduction?

[vox nihili]

Can mitosis be used as a form of asexual reproduction in some organisms?

Yep!

[RazzMeTazz]

Does aneuploidy always involve having one less of one type of chromosome (monosomy) or one more of one type of chromosome (trisomy)?

What about having one more of two types of chromosomes? (e.g having 3 of chromosome 21 and 3 of chromosome 18?)

Is that possible, or do those result in miscarriages?

[RazzMeTazz]

Would it be correct to say that when non-disjunction of homologous chromosomes occurs in anaphase 1 of meiosis, it always results in two gametes with one less of a particular chromosome (n-1), and two gametes with one more of a particular chromosome (n+1)

And that when non-disjunction of sister chromatids occurs in anaphase 2 of meiosis, it always results in two gametes with the normal haploid number (n), one gamete with one more of a chromosome (n+1) and one gamete with one less of a chromosome (n-1)?

Or does it vary each time?

[nerdmmb]

Do we need to know about the scientists who predicted the age of the earth such as James Hutton?

In general, would we have to know the names of the scientists who proposed theories pertaining to evolution?

Thanks!

[vox nihili]

Do we need to know about the scientists who predicted the age of the earth such as James Hutton?

In general, would we have to know the names of the scientists who proposed theories pertaining to evolution?

Thanks!

Darwin and Wallace, that's it.

[Scooby]

Would it be correct to say that when non-disjunction of homologous chromosomes occurs in anaphase 1 of meiosis, it always results in two gametes with one less of a particular chromosome (n-1), and two gametes with one more of a particular chromosome (n+1)

Yeah, providing meiosis II proceeds normally

And that when non-disjunction of sister chromatids occurs in anaphase 2 of meiosis, it always results in two gametes with the normal haploid number (n), one gamete with one more of a chromosome (n+1) and one gamete with one less of a chromosome (n-1)?

Yeah, again, providing meiosis I occurred normally

[nubs]

Does aneuploidy always involve having one less of one type of chromosome (monosomy) or one more of one type of chromosome (trisomy)?

What about having one more of two types of chromosomes? (e.g having 3 of chromosome 21 and 3 of chromosome 18?)

Is that possible, or do those result in miscarriages?

Aneuploidy is just when you don't have a multiple of 'n' sets of chromosomes. For humans, we normally have 2n chromosomes (46), so if an individual has 3 of 21 and 18, they have 48 chromsomes and exhibit aneuploidy, since 48 is not a multiple of n=23 I believe

[RazzMeTazz]

Are allosomes and heterosomes the same thing?

[alchemy]

Are allosomes and heterosomes the same thing?

I think so.

[nerdmmb]

Do we need to know about the different human species that existed such as the homo erectus?

Also, what is the difference between a mono hybrid and dihybrid cross?

Thanks!

[Rishi97]

Do we need to know about the different human species that existed such as the homo erectus?

Also, what is the difference between a mono hybrid and dihybrid cross?

Thanks!

A monohybrid cross is when only one gene is observed. Whereas a dihybrid cross is when two genes are involved

[Rod]

Do we need to know about the different human species that existed such as the homo erectus?

Yeah we had to last year. I made a flow chart with all the different human species starting from Australopithecus. In the exam they tested if you knew the different structures of body between two different human species.

[Micheal Jackson]

How to efficiently utilise reading time? Thanks!

So what works for you, but this is what I did in the bio exam. First, I flipped through the entire exam very quickly, because this helps to calm myself down (as I realise the qs are not too hard). Then I do as many multiple choices I can in my head and fill in the answers to multiple choice as soon as reading time ends. Good luck!