IB Biology HL A4.1.9 Adaptive radiation Question Bank
Practise IB Biology HL A4.1.9 by analysing how common ancestors diversify into niche-adapted forms through divergent selection.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Explain how homologous structures and different selection pressures produce adaptive radiation.
- Trace finch beak variation, feeding advantage and inherited frequency change in a population.
A4.1.9 (HL)—Adaptive radiation question 1
Evolution occurs when heritable characteristics of a species change. The diagram shows an evolutionary chart of elephants.
Charles Darwin observed differences in the beaks of several finch species on the Galapagos Islands.
1. G. magnirostris
3. G. parvula
2. G. fortis
4. C. olivacea
Outline the development of beak differences in these finches.
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