IB Biology SL 3.1.11 Self-incompatibility mechanisms Question Bank
Practise IB Biology SL 3.1.11 by explaining how self-incompatibility prevents self-fertilisation and inbreeding.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Explain how self-incompatibility alleles prevent self-fertilisation.
- Relate self-incompatibility to reduced inbreeding and maintained genetic 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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