A2 Biology | Post your doubts here

[omair tahir]

ok so do we have to know t tests and chi tests for p4??!!

No
If anything about it will come thn the table fr it wil be givn

 

[ousamah112]

ok so do we have to know t tests and chi tests for p4??!!

yes..chi square q can come in p4

 

[omair tahir]

yapp... u jst need to knw ,,,, cz they might ask in p4 ... in previous years they did ask abt it in p4...

Asha in previous they gave us a table about it

 

[angelgirl:)]

thxx ashaa...and good night......have to take some sleep b4 waking up early..... goodnight anglegirl.... see u tom and best of luck 2 both of u .....

thanks ...same to u to...Allah hafiz..

 

[Asha Tabassum]

Asha in previous they gave us a table about it[/quot

i knw table was given...... bt there are questions asked based on the idea of it... so bttr we dont ignore at all fr p4.... we can jst hav the basic idea of it.,

 

[Asha Tabassum]

thxx ashaa...and good night......have to take some sleep b4 waking up early..... goodnight anglegirl.... see u tom and best of luck 2 both of u .....

Good night dear..... Good luck fr the xm... Allah hafiz

 

[hm12]

can anyone explain me about test cross and back cross?

 

[omair tahir]

Agreed thnx best of luck

 

[user]

Assalamoalaikum wr wb!

Explain the role of isolating mechanisms in the evolution of new species;

​

​

1. allopatric speciation ;​

2. geographical isolation / spatial separation ;​

3. e.g. of barrier ;​

4. e.g. of organism ; must relate to 3​

5. sympatric speciation ;​

6. example ;​

7. meiosis problems ;​

8. polyploidy ;​

9. behavioural / temporal / ecological / structural, isolation ;​

10. (isolated) populations, prevented from interbreeding / can only breed​

11. amongst themselves ;​

12. no, gene flow / gene mixing, (between populations) ;​

13. different selection pressures operate ;​

14. natural selection ;​

15. change in allele frequencies ;​

16. different gene pool ;​

17. over time (differences prevent interbreeding) ;​

18. reproductively isolated ;​

​

Can someone plz frame an answer for this ... ​

 

[angelgirl:)]

Assalamoalaikum wr wb!

Explain the role of isolating mechanisms in the evolution of new species;

​

​

1. allopatric speciation ;​

2. geographical isolation / spatial separation ;​

3. e.g. of barrier ;​

4. e.g. of organism ; must relate to 3​

5. sympatric speciation ;​

6. example ;​

7. meiosis problems ;​

8. polyploidy ;​

9. behavioural / temporal / ecological / structural, isolation ;​

10. (isolated) populations, prevented from interbreeding / can only breed​

11. amongst themselves ;​

12. no, gene flow / gene mixing, (between populations) ;​

13. different selection pressures operate ;​

14. natural selection ;​

15. change in allele frequencies ;​

16. different gene pool ;​

17. over time (differences prevent interbreeding) ;​

18. reproductively isolated ;​

​

Can someone plz frame an answer for this ... ​

can u tell me which year is it?

 

[MAKKAWII]

is dere any predicted questions fr ppr 4??? if yess plz post dem!! thanx

 

[user]

can u tell me which year is it?

Nov 2008 i think..

 

[confused_soul]

Protometer and bio markers please explain any 1

 

[omair tahir]

I

Assalamoalaikum wr wb!

Explain the role of isolating mechanisms in the evolution of new species;

​

​

1. allopatric speciation ;​

2. geographical isolation / spatial separation ;​

3. e.g. of barrier ;​

4. e.g. of organism ; must relate to 3​

5. sympatric speciation ;​

6. example ;​

7. meiosis problems ;​

8. polyploidy ;​

9. behavioural / temporal / ecological / structural, isolation ;​

10. (isolated) populations, prevented from interbreeding / can only breed​

11. amongst themselves ;​

12. no, gene flow / gene mixing, (between populations) ;​

13. different selection pressures operate ;​

14. natural selection ;​

15. change in allele frequencies ;​

16. different gene pool ;​

17. over time (differences prevent interbreeding) ;​

18. reproductively isolated ;​

​

I

Can someone plz frame an answer for this ... ​

Its in may june 2005 too

Species are evolved by allopatric and sympatric speciation. Isolating mechanisms plays a very imp role in separation of differnt groups of species whch may later develop into new species .. In allopatric speciatn geographical isolation occurs in which species are separated by geographical barriers.. In sympatric speciation reproductive isolation takes place new species may arise through polyploidy.. They have behavourial barriers within the population... They cannt interbreed so no gene flow.. Natural selection Occurs and species wid best adaptd traits survives and bring about change in allele frequency and gene pool of population becomes differnt

Angelgirl plx chk it out and tell me if theres any mistake

 

[angelgirl:)]

I
Its in may june 2005 too

Species are evolved by allopatric and sympatric speciation. Isolating mechanisms plays a very imp role in separation of differnt groups of species whch may later develop into new species .. In allopatric speciatn geographical isolation occurs in which species are separated by geographical barriers.. In sympatric speciation reproductive isolation takes place new species may arise through polyploidy.. They have behavourial barriers within the population... They cannt interbreed so no gene flow.. Natural selection Occurs and species wid best adaptd traits survives and bring about change in allele frequency and gene pool of population becomes differnt...

Angelgirl plx chk it out and tell me if theres any mistake

yes good framing

 

[omair tahir]

Thnx

 

[zohak]

Good Luck Guyzz.. IA fyt ho ga. Allah will help us

 

[user]

Good Luck Guyzz.. IA fyt ho ga. Allah will help us

aameennnnn

 

[angelgirl:)]

good luck to all...
and yes Insha Allah it will be fine...

 

[omair tahir]

Insha'Allah