IB Biology SL A4.1.6 Speciation Question Bank
Practise IB Biology SL A4.1.6 by explaining how isolation, different selection pressures and divergence can form new species.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Explain how isolated gene pools diverge under different selection pressures and form new species.
- Use geographic isolation and divergent evolution to explain a speciation example.
A4.1.6—Speciation by splitting of pre-existing species question 1
[Maximum number: 4]
Explain how divergent evolution may contribute to speciation.
Speciation is the formation of new species from pre-existing ones.
Usually by isolation of a population/gene pool.
Eventually gene pools are so different that interbreeding cannot occur.
Allopatric/sympatric speciation occurs.
Divergent evolution is where different populations adapt to different ecological roles / adaptive radiation / avoid competition.
Result of natural selection / competitive advantage of one population over another.
Example, e.g. Darwin's finches / mammalian pentadactyl limb / any other verifiable example of divergent evolution.
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