AQA BIOL2 Biology Unit 2 Exam - 26th May 2011

What is a heirachy. Not sure how to word it.

Reply 422

Introverted moron

Original post by ??????????????????

What is a heirachy. Not sure how to word it.

From what I remember from doing a past paper, a hierarchy is smaller groups within larger groups and there is no overlap - not a great definition, but it'll do hopefully. :tongue:

Reply 423

LifeIsGood

Original post by Introverted moron

From what I remember from doing a past paper, a hierarchy is smaller groups within larger groups and there is no overlap - not a great definition, but it'll do hopefully. :tongue:

Groups within larger groups with no overlap [2 marks]

Reply 424

Question:

Explain the process of meiosis and how this can lead to genetic variation in gametes?

Reply 425

Jasx

Original post by TlanTlan

Question:

Explain the process of meiosis and how this can lead to genetic variation in gametes?

Meiosis
-Involves 2 nuclear divisions.

1. First division/Meiosis 1
Homologous chromosomes (pair of chromosomes-1 from mother one from father) pair up & their chromatids wrap around each other
*Crossing over (leads to some genetic variation as alleles are swapped) & *Independent segregation (chromosomes pair up randomly also leads to variation).
The homologous pairs then separate -one chromosome from each pair goes to one of the 2 daughter cells.

2. Second division/Meiosis 2
Chromosomes (from 2 daughter cells) split into chromatids into 4 haploid cells (gametes).

Not sure if this is everything.. :/

Reply 426

LifeIsGood

Original post by TlanTlan

Question:

Explain the process of meiosis and how this can lead to genetic variation in gametes?

Genetic Variation
-Independent segregation
-Crossing Over

*Is random fusion of gametes one too?

Reply 427

Original post by LifeIsGood

Genetic Variation
-Independent segregation
-Crossing Over

*Is random fusion of gametes one too?

Do you mean when the diploid parent cell produces haploid daughter cells which fuse giving 1/2 genes from each parent?
If so yes.

Reply 428

That comes after gametes, but if a question hints at genetic variation, it can't hurt to put it down.

Reply 429

romanika10

does any one have the january 2009 unit 2 paper cz itz nt on the website..many thanxx

Reply 430

SnookerLoopy

Original post by romanika10

does any one have the january 2009 unit 2 paper cz itz nt on the website..many thanxx

There wasn't a Biol 2 in jan 09...the first Biol 2 on the new spec was not until June 09 :smile:

As for Jan 2011, can somebody please inbox me it :smile:

thanks

Reply 431

It's on the first page of this thread if you haven't already seen.

Reply 432

SnookerLoopy

Yea but it isn't working for me as a .zip on this laptop :frown:

Reply 433

Original post by georgia.

Just about to begin to teach myself the whole of unit 2 as I hate this subject... wish me luck.

I wish uuuu.... LUCK :wink:

Thank me later... :cool:

Reply 434

Original post by therapist_1

I wish uuuu.... LUCK :wink:

Thank me later... :cool:

Your username would be very disturbing if I didn't know you were doing biology.(trying to become a something therapist?)

On topic, are the exams more based on knowledge base or just giving educated suggestions? The past papers I'm doing are all suggest this suggest that not asking stuff like list 2 features of arteries ,for example.

(edited 12 years ago)

Reply 435

Original post by ??????????????????

I feel that the exams are more HSW based and you have to be very good at interpreting data, there are one or two direct questions such as label or calculate. :cool:

by the way my username is two words first one being 'the -', you get it then you will smile...lol :colone:

Reply 436

Original post by therapist_1

I feel that the exams are more HSW based and you have to be very good at interpreting data, there are one or two direct questions such as label or calculate. :cool:

by the way my username is two words first one being 'the -', you get it then you will smile...lol :colone:

I hate those type of questions because you don't really learn about it?
Yeah I know... :colone:

Reply 437

Original post by ??????????????????

I hate those type of questions because you don't really learn about it?
Yeah I know... :colone:

Yup thats why I hate bio...just gona push my luck and see what I could do..I'm goin through all HSW from text book and past papers now..then I have to dosome C2 maths......mr brain is gona POP!! :banghead:

................. :colone:

Reply 438

Original post by ??????????????????

I hate those type of questions because you don't really learn about it?
Yeah I know... :colone:

Just for talk... BLEACH is AWESOME!!! :cool:

Reply 439