IB Biology HL 3.1.11 Self-incompatibility mechanisms Question Bank
Practise IB Biology HL 3.1.11 by analysing how pollen recognition blocks self-fertilisation and preserves diversity.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Analyse how allele recognition prevents incompatible pollen from fertilising an ovule.
- Evaluate self-incompatibility as a mechanism that limits inbreeding and maintains variation.
D3.1.11—Self-incompatibility mechanisms question 1
[Maximum number: 1]
Cherry trees (Prunus avium) have two self-incompatibility alleles. What benefit do self-incompatibility alleles have?
A
They decrease genetic variation.
B
They prevent inbreeding.
C
They decrease the chances of mutations taking place within the gametes.
D
They prevent the plant from releasing pollen at certain times of the year.
B
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