nexttttt (2 Viewers)

[advanced sam]

hey danoz direct, long time no speak.

its sad really, they are not on tv any more

 

[dolbinau]

thanks for that. there are some other good youtube videos that explain meiosis well: http://au.youtube.com/watch?v=D1_-mQS_FZ0

my teacher said that remembering each phase is not necessary for our syllabus. we just need to know that in meiosis crossing over, random segragation and independent assortment occurs, and how this leads to variability in offspring.

What is the difference between random segregation and independent assortment?

 

[gloworm14]

thanks for that. there are some other good youtube videos that explain meiosis well: http://au.youtube.com/watch?v=D1_-mQS_FZ0

my teacher said that remembering each phase is not necessary for our syllabus. we just need to know that in meiosis crossing over, random segragation and independent assortment occurs, and how this leads to variability in offspring.

that was pretty good.
haha the gametes look like oranges.:uhhuh:

 

[danz90]

What is the difference between random segregation and independent assortment?

from what i remember, random segregation is the way that paternal and maternal chromosomes of each homologous pair of chromosomes separate randomly, ie not all paternally-derived chromosomes go into one gamete and then all maternal into another gamete. so basically, the way that the chromosomes are arranged into haploid gametes is random.

independent assortment - well basically this talks about that alleles of a gene pair separate at meiosis. and these alleles are not inherited together, that is they assort independently of each other. for example, when a brown hair, blue eyed person mates with a blonde hair brown eyed person... it is still possible for a brown hair, brown eyed offspring and for a blonde hair blue eyed offspring, because the alleles for eye and hair colour separate independently of each other. so in other words, alleles of genes are not linked and separate independently of each other.

this is my understanding anyway.

 

[sam2100]

What is the difference between random segregation and independent assortment?

two terms for similar thing
difference not needed to be known for hsc course


sorry if this has been discussed on a page i havent looked at but:


HAS ANYONE NOTICED ANY PARTS OF THE SYLLABUS FROM PAST HSC PAPERS WHICH HAVE NOT YET BEEN TESTED AND MADE NOTE OF THEM?

if not

WHAT DID MOST PEOPLES TRIAL PAPERS SEEM TO FOCUS ON?

 

[gloworm14]

from what i remember, random segregation is the way that paternal and maternal chromosomes of each homologous pair of chromosomes separate randomly, ie not all paternally-derived chromosomes go into one gamete and then all maternal into another gamete. so basically, the way that the chromosomes are arranged into haploid gametes is random.

independent assortment - well basically this talks about that alleles of a gene pair separate at meiosis. and these alleles are not inherited together, that is they assort independently of each other. for example, when a brown hair, blue eyed person mates with a blonde hair brown eyed person... it is still possible for a brown hair, brown eyed offspring and for a blonde hair blue eyed offspring, because the alleles for eye and hair colour separate independently of each other. so in other words, alleles of genes are not linked and separate independently of each other.

this is my understanding anyway.

i think you're right because i remember random segregation is a separation in the latter stage of meiosis, which is probably the last separation when it goes from 2 cells to 4 haploid gametes.
crossing over is in the early stage.

 

[bekmay]

Anyone do the option The code broken?

Can someone tell me what is the crrent understanding of gene expression?

ok here i go with my limited understanding...

research in gene expression regards the sequence of an organism's DNA and then, obviously, how it is expressed. the DNA sequence of humans differ form chimpanzee's DNA by only 2%, for example, and the research of gene expression aims to determine how we are so different even though we are genetically so similar. We have found that it isn't just the organism's sequence of genes that determines it's features, rather the sequences in which the genes are switched on or off throughout it's lifetime. Sequence may be reallly small in the DNA, a little bigger in embryotic development, but as it grows these tiny differences amount to an extremely different organism.
eg through the HGP we know that humans have about 30000 genes, but in each cell only approx 50% of the info is used (cell differentiation and/or specialisation).

hope that helps

 

[gloworm14]

alot of the same questions have been popping up constantly
i suggest everyone to go over:
the work of all the major figures: mendel, pasteur+koch, beadle+tatum, watson+crick, sutton+boveri, darwin+wallace
xylem/phloem
nephrons+kidney stuff
blood+ artificial blood
adh+aldosterone
antibiotics
vaccinations
meiosis/mitosis
all the quarantine stuff
immune system
know your pathogen types

my previous post on what type of questions kinda repeated throughout the past papers

 

[midifile]

from what i remember, random segregation is the way that paternal and maternal chromosomes of each homologous pair of chromosomes separate randomly, ie not all paternally-derived chromosomes go into one gamete and then all maternal into another gamete. so basically, the way that the chromosomes are arranged into haploid gametes is random.

independent assortment - well basically this talks about that alleles of a gene pair separate at meiosis. and these alleles are not inherited together, that is they assort independently of each other. for example, when a brown hair, blue eyed person mates with a blonde hair brown eyed person... it is still possible for a brown hair, brown eyed offspring and for a blonde hair blue eyed offspring, because the alleles for eye and hair colour separate independently of each other. so in other words, alleles of genes are not linked and separate independently of each other.

this is my understanding anyway.

Yeah. Thats right =]

 

[sam2100]

from what i remember, random segregation is the way that paternal and maternal chromosomes of each homologous pair of chromosomes separate randomly, ie not all paternally-derived chromosomes go into one gamete and then all maternal into another gamete. so basically, the way that the chromosomes are arranged into haploid gametes is random.

independent assortment - well basically this talks about that alleles of a gene pair separate at meiosis. and these alleles are not inherited together, that is they assort independently of each other. for example, when a brown hair, blue eyed person mates with a blonde hair brown eyed person... it is still possible for a brown hair, brown eyed offspring and for a blonde hair blue eyed offspring, because the alleles for eye and hair colour separate independently of each other. so in other words, alleles of genes are not linked and separate independently of each other.

this is my understanding anyway.

your definition of IA is correct however with your example, i think you mean to say that if ONE individual contains the alleles for brown hair and blonde hair and the alleles for blue eye and brown eye they can combine as: brown/brown, blonde/blue, brown/blue, blonde/brown

 

[midifile]

two terms for similar thing
difference not needed to be known for hsc course


sorry if this has been discussed on a page i havent looked at but:


HAS ANYONE NOTICED ANY PARTS OF THE SYLLABUS FROM PAST HSC PAPERS WHICH HAVE NOT YET BEEN TESTED AND MADE NOTE OF THEM?

if not

WHAT DID MOST PEOPLES TRIAL PAPERS SEEM TO FOCUS ON?

For the genetics option HOM/HOX/limb bud formation have never been tested in an HSC.

I dont think malaria has been asked in an HSC paper (although Ive seen it in some trials), neither has modelling pasteurs experiment

 

[dolbinau]

i think you're right because i remember random segregation is a separation in the latter stage of meiosis, which is probably the last separation when it goes from 2 cells to 4 haploid gametes.
crossing over is in the early stage.

Crossing over occurs in Prophase which is an early stage, but I always thought Random segregation occurs in Metaphase which is after crossing over - when the homologous genes line up across the equator randomly and then 'segregate' into the two daughter cells and beyond? I don't know it can be kind of confusing.

 

[sam2100]

For the genetics option HOM/HOX/limb bud formation have never been tested in an HSC.

I dont think malaria has been asked in an HSC paper (although Ive seen it in some trials), neither has modelling pasteurs experiment

thanks !!! exactly the kind of answer i wanted

 

[bekmay]

from what i remember, random segregation is the way that paternal and maternal chromosomes of each homologous pair of chromosomes separate randomly, ie not all paternally-derived chromosomes go into one gamete and then all maternal into another gamete. so basically, the way that the chromosomes are arranged into haploid gametes is random.

independent assortment - well basically this talks about that alleles of a gene pair separate at meiosis. and these alleles are not inherited together, that is they assort independently of each other. for example, when a brown hair, blue eyed person mates with a blonde hair brown eyed person... it is still possible for a brown hair, brown eyed offspring and for a blonde hair blue eyed offspring, because the alleles for eye and hair colour separate independently of each other. so in other words, alleles of genes are not linked and separate independently of each other.

this is my understanding anyway.

HAHA 'mates'. it sounds funny talking about people mating.
um yeah awesome explaination. i dont think we need to know the difference for this course though do we? i mean as far as we're supposed to be concerned, random segregation=independent assortment?

 

[gloworm14]

For the genetics option HOM/HOX/limb bud formation have never been tested in an HSC.

I dont think malaria has been asked in an HSC paper (although Ive seen it in some trials), neither has modelling pasteurs experiment

they've asked to give cause/symptom/prevention/control/elimination etc on ONE infectious disease [i would've used malaria] in a past paper
but i dont think they've actually had a question that specifically refers to malaria.

 

[gloworm14]

HAHA 'mates'. it sounds funny talking about people mating.
um yeah awesome explaination. i dont think we need to know the difference for this course though do we? i mean as far as we're supposed to be concerned, random segregation=independent assortment?

i like to call it 'making love'

study update: im up to the last point of search for a better health.
communication next.

 

[midifile]

HAHA 'mates'. it sounds funny talking about people mating.
um yeah awesome explaination. i dont think we need to know the difference for this course though do we? i mean as far as we're supposed to be concerned, random segregation=independent assortment?

I dont think theyd specifically ask you "what is the difference between independant assortment and random segregation" but they might give you a diagram and say "what is happening here" and if you say the wrong one they might mark you down.

In my pretrials we had a question which described random segregation, and asked you to identify which process it was, and people who put independent assortment didnt get the mark. But maybe that as just my teacher becasue she is a harsh marker.

 

[sam2100]

HAHA 'mates'. it sounds funny talking about people mating.
um yeah awesome explaination. i dont think we need to know the difference for this course though do we? i mean as far as we're supposed to be concerned, random segregation=independent assortment?

yer we dont need to know that level of detail. however that persons explanation was a bit flawed if ur gonna use it to learn


the definition of IA is correct however with the example, i think they mean to say that if ONE individual contains the alleles for brown hair and blonde hair and the alleles for blue eye and brown eye they can combine in GAMETES (not offspring) as: brown/brown, blonde/blue, brown/blue, blonde/brown

 

[ALGALELE]

i like to call it 'making love'

study update: im up to the last point of search for a better health.
communication next.

wtf how fast did u finish search for beter health!

 

[dolbinau]

Does anyone know specifically when in meiosis random segregation occurs?