Explain how isolation changes gene pools, identify reproductive barriers and evaluate population evidence for speciation.
Explain how bonobos could have evolved from chimpanzees by speciation.
a. (later) rise in water level led to geographical/geographic isolation;
b. reproductive isolation / no interbreeding (because of barrier) / no gene flow (between populations);
c. different selective pressures/environments (for each population);
d. different adaptations favoured/survive and reproduce more / differential selection/natural selection (for each population);
e. populations diverge/can no longer interbreed (even when barrier is removed);
d. Must refer to adaptations and the action
i.e. survive and reproduce.
3
Marking guidance:
max