• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

A2 Biology | Post your doubts here

Messages
505
Reaction score
739
Points
103
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 ... :(
 
Messages
532
Reaction score
151
Points
53
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?
 
Messages
27
Reaction score
8
Points
13
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 :)
 
Messages
532
Reaction score
151
Points
53
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(y)
 
Top