VCE Biology Question Thread

[vox nihili]

The genes are linked.. meaning that they are more likely to be passed down together (on the one chromosome) to offspring? I'm not really sure :/ for some reason my class hasn't covered linked genes yet.. we're kind of skipping between AOS 1 and AOS 2

That's all right! Linked genes are a minor part of the course and are pretty tricky.


Have a think about this. How are genes passed on to offspring? Think about meiosis and how that works, and the relationship between meiosis and inheritance (hint: meiosis is the key to inheritance, that's why it's so important you know it).
Once you've done that, now think about what would happen if two genes were next to each other on the same chromosome. How would they be inherited?

Can someone confirm for me, that's a autosomal dominant right?

Nope. The dot just means that one is a carrier, so it means they've got one recessive allele without having the trait.

[plsbegentle]

Nope. The dot just means that one is a carrier, so it means they've got one recessive allele without having the trait.

Opps, didnt realise you cant 'quote' an image. I was talking about the image that gogi14 attached. Sorry i dont know how to attach it myself, atar notes noob

[vox nihili]

Opps, didnt realise you cant 'quote' an image. I was talking about the image that gogi14 attached. Sorry i dont know how to attach it myself, atar notes noob

You can add attachments just below the text box when you write a reply

All good though, took me forever to work out AN...still working out some things :p


My reply still stands though. Circle with a dot is a female carrier.

[plsbegentle]

You can add attachments just below the text box when you write a reply

All good though, took me forever to work out AN...still working out some things :p


My reply still stands though. Circle with a dot is a female carrier.

After another attempt, i think its X-linked recessive, man i use to ace pedigree charts in yr 10, need more practice

[epichedgehog]

That's all right! Linked genes are a minor part of the course and are pretty tricky.


Have a think about this. How are genes passed on to offspring? Think about meiosis and how that works, and the relationship between meiosis and inheritance (hint: meiosis is the key to inheritance, that's why it's so important you know it).
Once you've done that, now think about what would happen if two genes were next to each other on the same chromosome. How would they be inherited?

So does that mean that the genes for high milk yield and low fertility in the selectively bred cows are close together, and less likely to be crossed over during genetic recombination in meiosis?
Thanks for your help.

[vox nihili]

So does that mean that the genes for high milk yield and low fertility in the selectively bred cows are close together, and less likely to be crossed over during genetic recombination in meiosis?
Thanks for your help.

Yep, but what does that mean. How are the genes inherited?

[Apink!]

Hello,

Could someone please explain to me why sex chromosomes do NOT sort independently?

[plsbegentle]

Hello,

Could someone please explain to me why sex chromosomes do NOT sort independently?

Do u mean linked genes? I'm fairly sure sex chromosomes sort independently or am i missing something?

[Gogo14]

Hello,

Could someone please explain to me why sex chromosomes do NOT sort independently?

Not sure, maybe because they are not homologous chromosomes

[HasibA]

can someone please explain independent assortment- like my definition is literally chromosomes are sorted independently...xD
help would be nice- google's not being very helpful rn :')
crossing over- anyone have a nice vce biol definition for it? thank youuu!

[plsbegentle]

can someone please explain independent assortment- like my definition is literally chromosomes are sorted independently...xD
help would be nice- google's not being very helpful rn :')
crossing over- anyone have a nice vce biol definition for it? thank youuu!

Independent assortment is the arrangement of chromosomes in which it provides genetic variance in offspring. So in meta phase 1, when chromosomes line up in the equator, homologous chromosomes can swap positions so different gamete combinations can be produced. Fun fact, there could be 8 million different possible gametes (2^23).

Crossing over is exchanging genetic information between homologous chromosomes. A image on google would help

Just letting u know, these arent vcaa definitions but i hope they helped.

[HasibA]

<snip>

Pretty much what i wrote on my sac- sounds good, thank you.

P.S my class has only started mutations, and starts inheritance next week- is that roughly where everyone else is on? thanks!

[plsbegentle]

Pretty much what i wrote on my sac- sounds good, thank you.

P.S my class has only started mutations, and starts inheritance next week- is that roughly where everyone else is on? thanks!

No, we're up to evolution, starting next week doing chapter 14 in NoB. Mutations are really easy and im guessing you've done all the gene function stuff; transcription, translation? You should be good, our class is just really ahead because we skip a lot of stuff.

[HasibA]

<snip>

yeah , using heinemann biology textbook and we've covered like gene tech stuff, transcription and translation, working in order- mutations has been covered in like a week aha! so your class skipped some chapters in NoB? Which ones if i may ask- feel slightly rushed but who knows rn! thanks!

[plsbegentle]

yeah , using heinemann biology textbook and we've covered like gene tech stuff, transcription and translation, working in order- mutations has been covered in like a week aha! so your class skipped some chapters in NoB? Which ones if i may ask- feel slightly rushed but who knows rn! thanks!

All of chapter 10 which is Mendelian inheritance, nature,structure and organisation of the genetic material. I did it at home just in case but pretty useless. We did 3 sacs with macrob at melb uni, so we had to really cover all the content in the 3rd week of term. Last week we basically went through everything again and now starting on evolution.