Mechanisms for Reproductive Isolation (Grade 12 NSC Matric Life Sciences): Flashcards
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Reproductive isolation
Reproductive isolation
Prevents species mating & producing fertile offspring
4 main mechanisms of reproductive isolation
4 main mechanisms of reproductive isolation
Temporal, courtship, pollinator adaptation, hybrid sterility
Temporal isolation
Temporal isolation
Species breed/flower at different times of year
Species-specific courtship behaviour
Species-specific courtship behaviour
Specialised rituals that attract only own species
Pheromones in courtship
Pheromones in courtship
Species-specific chemical messengers
Pollinator adaptation (plants)
Pollinator adaptation (plants)
Plants evolved partnerships with specific pollinators
Hybrid sterility
Hybrid sterility
Hybrid offspring cannot reproduce
Example of hybrid sterility
Example of hybrid sterility
Mules (horse+donkey offspring) are typically sterile
Speciation
Speciation
Formation of new species
Why reproductive isolation matters
Why reproductive isolation matters
Maintains biodiversity and prevents species merging