VCE Biology Question Thread

[Reus]

In Meisosis, at what stage does Independent Assortment and Segregation occur at? As in at which stage of Prophase 1, Meta 1, Ana 1, Telo 1, Prophase 2, Meta 2, Ana 2, Telo 2?

Also could someone provide good definitions for both those terms?

Independent Assortment occurs in metaphase I and Segregation occurs in anaphase I.

Segregation can be defined as the separation of paired alleles during the stage of meiosis and their independent transmission through separate gametes.
(I don't really have a definition for IA haha, even if I did it'd be informal and my interpretation)

[DJA]

Independent Assortment occurs in metaphase I and Segregation occurs in anaphase I.

Segregation can be defined as the separation of paired alleles during the stage of meiosis and their independent transmission through separate gametes.
(I don't really have a definition for IA haha, even if I did it'd be informal and my interpretation)

Legend. tyvm

[Rishi97]

Yup! I did 

Thanks Reus
Are you able to give me a brief version of what was composed of in the sac? I know that our sacs will be completely different but just a brief run down of the main points will be truly amazing.
Thanks heaps!!!

[dankfrank420]

Anyone going Melb Uni this week for the practical part of the SAC?

Oh, and I just found out my school is having 2 SACs instead of 3 for the 50/100 mark outcome. Bugger 

[Reus]

Thanks Reus
Are you able to give me a brief version of what was composed of in the sac? I know that our sacs will be completely different but just a brief run down of the main points will be truly amazing.
Thanks heaps!!!

Uh well you cut small pieces of garlic roots, which then are incubated (forgot the temperature) and later stained in order to be seen through the microscope. Literally all we was identity the stages of mitosis within the root tip. After that, we had to count how many of each stage was observed. Additionally a class average was obtained and set up on a table. The stages of mitosis were also required to be drawn (diagrams + labels the usual haha).

In terms of the SAC itself, questions ranged from all sorts really. Hypothesis, IV and DV, why incubation occurred, differences between mitosis and meiosis, questions specific to polypoids (garlic being a plant). If you want more specifics or any sort of assistance, don't hesitate to message me

Hope this helped.

[Rishi97]

Uh well you cut small pieces of garlic roots, which then are incubated (forgot the temperature) and later stained in order to be seen through the microscope. Literally all we was identity the stages of mitosis within the root tip. After that, we had to count how many of each stage was observed. Additionally a class average was obtained and set up on a table. The stages of mitosis were also required to be drawn (diagrams + labels the usual haha).

In terms of the SAC itself, questions ranged from all sorts really. Hypothesis, IV and DV, why incubation occurred, differences between mitosis and meiosis, questions specific to polypoids (garlic being a plant). If you want more specifics or any sort of assistance, don't hesitate to message me

Hope this helped.

Thanks Reus
haha yep there will be a lot of messages from me during the week. I don't think mitosis and meiosis is my strongest topic

[vox nihili]

Thanks Reus
haha yep there will be a lot of messages from me during the week. I don't think mitosis and meiosis is my strongest topic

Just track those chromosomes and you'll be sweet.

[nerdmmb]

Are there any resources that you guys would recommend for the mitosis and meiosis SAC?

Thanks

[Reus]

Are there any resources that you guys would recommend for the mitosis and meiosis SAC?

Thanks

This is quite decent
http://www.vce.bioninja.com.au/aos-3-heredity/cell-reproduction/cell-cycle.html#previous-photo

[Frozone]

does anyone have a simple explanation of hemizygous? The definitions i found are confusing.

[vox nihili]

does anyone have a simple explanation of hemizygous? The definitions i found are confusing.

only one copy of the gene rather than the normal (for humans) 2

[Reus]

does anyone have a simple explanation of hemizygous? The definitions i found are confusing

It's simply the presence of a single copy of a gene, for example the X chromosome for males (humans).

edit: Mr. T-Rav beat me to it! 

[Frozone]

Thanks for that!
Does anyone have an easy way of explaining a dihybrid cross? My book( and teacher tbh) explains it poorly.

[Reus]

Thanks for that!
Does anyone have an easy way of explaining a dihybrid cross? My book( and teacher tbh) explains it poorly.

A dihybrid cross is where the inheritance of two traits eventuate. So basically there will be two genes each with two alleles, meaning that there are now up to four possible gametes (monohybrid had two).

The new punnet square will contain 16 boxes.

[Frozone]

A dihybrid cross is where the inheritance of two traits eventuate. So basically there will be two genes each with two alleles, meaning that there are now up to four possible gametes (monohybrid had two).

The new punnet square will contain 16 boxes.

Thanks alot! And another question.
what does it mean when it says "only hemizygous genotypes are possible for sex linked conditions"?