Biology of cells and organisms

[Starlight]

check out that tutorial thing on the last preprac (on the development of the toad) if it is still up, it has a part on gastrulation

[Starlight]

Ignore everything Russ just told you.

Probably a little too in depth, thank god!

[anonymous1]

Do you need to know the actual process?

Not sure how much of this you already know, but here's my understanding:

It's when the epiblast (that specific half of the inner cell mass) gives off the three fundamental germ cell layers. The epiblast develops something called the primitive streak, which is just thicker cells than usual. These cells then invaginate and descend towards the hypoblast (the bit behind the epiblast). This folding gives rise to the primitive groove.

Cells migrate into the primitive groove and take up residence in the space between the epiblast and hypoblast; the first ones become the endoderm and the later ones become the mesoderm. What's left in the epiblast becomes the ectoderm.

That's my understanding of how it occurs, hope it helps/

wow!
you explained it so well, i understand it now Thankyou so much!
i don't think we need to know this but it helps me when i know what is going on and not just the labeling and outcomes, then i just get confused so i like to know exactly whats happening-helps me understand

edit: @ El2012 i love how you summed up grastulation, it sounds so simple in those terms : single-layed blastula is reorganised into a trilaminar structure

[Russ]

Ignore everything Russ just told you.

If I have to know it, other people have to share in the misery that is embryology

[Starlight]

Has anyone else done the sample paper edmund gave us? would you say some of it we haven't looked at in lectures? :S

[jinny1]

Is the fingers and sexual attraction thing real??? Lol does he expeect us to learn that?? -.-

my 2D:4D ratio is pretty good..

[Starlight]

Is the fingers and sexual attraction thing real??? Lol does he expeect us to learn that?? -.-

my 2D:4D ratio is pretty good..

Hahahah, according to 'studies' conducted. I just learnt the advantages of low 2D:4D ratio, what it's correlated with etc.

[anonymous1]

El2012 i felt the same about that exam, i don't think all of it is relevant, but most of it is useful

[jinny1]

Has anyone else done the sample paper edmund gave us? would you say some of it we haven't looked at in lectures? :S

I think that's from before the new melbourne model started isn't it??

so differentt study design probably

[Russ]

Uni study designs go along the lines of "how much content can I reuse from when i previously taught this subject last year"

If it's on the 08 exam but wasn't taught in '12 you don't need to know it.

[jinny1]

yipee!! just finished "briefly" going through all the lectures this semester.

i am the world's worst crammerrrrrrr

[anonymous1]

^ trust me your not, i did the same i have finished going over all of the lectures briefly, tommorow would be spent trying to memorise everything from lecture 1-33

[jinny1]

^ trust me your not, i did the same i have finished going over all of the lectures briefly, tommorow would be spent trying to memorise everything from lecture 1-33

haha we can do this!!

[anonymous1]

hopefully

[Difficultlife]

I remember that the exam a few years ago had a relatively confusing question/s in the long answer on thermoregulation/osmoregulation that was difficult if you weren't completely confident with the terminology -

I can only recall the key being to recognise that some ectotherms thermoregulate behaviourally (unable to physiologically influence body temperature), whilst some can only thermoconform to their environment (aquatic animals).

And it also included something about adaptive hypothermia that expected you to know that 'bears' aren't true hibernators or something to that effect. I can somewhat remember hummingbirds being in there too.