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D3.1.11—Self-incompatibility mechanisms

Self-incompatibility mechanisms prevent self-fertilization in flowering plants and reduce inbreeding by rejecting genetically similar or self pollen during pollination events.

Syllabus
First assessment 2025
Objective
D3.1.11
Level
HL

Concept essentials

  • Self-incompatibility prevents inbreeding rather than decreasing variation.
  • Recognition of self or similar alleles can block pollen success.
  • The mechanism promotes outcrossing and supports genetic diversity.
ConceptIB Biology HL