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Isolation Mechanisms
External
Internal
- Pre-fertilization
- Pollen-stigma incompatibility: Datura
- Pollen tube-style incompatibility: Iris
- Post-fertilization
- Embryo Death: Datura, Iris, Gossypium
- Endosperm Death
- Seedling Inviability: Crepis, Gossypium, Gilia, Papaver
- Hybrid Sterility: Nicotiana, Solanum, Streptocarpus, Zea
- Hybrid Breakdown (weak or defective F2 or later generations): Gilia, Layia
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