IB Biology SL A4.1.7 Reproductive isolation Question Bank
Practise IB Biology SL A4.1.7 by linking geographic, behavioural and temporal barriers to gene-pool divergence and speciation.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Identify geographic, behavioural or temporal barriers that reduce gene flow between populations.
- Explain how natural selection and reproductive isolation can lead to speciation.
A4.1.7—Reproductive isolation and differential selection question 1
[Maximum number: 3]
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
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