| 11. | Many generations of reproductive isolation of these different groups may result in speciation.
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| 12. | This sort of reproductive isolation has contributed to the divergence of the clade.
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| 13. | When the two varieties were cross-bred, the eggs were infertile, suggesting reproductive isolation.
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| 14. | Many studies point to sexual selection as a way of maintaining reproductive isolation.
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| 15. | These incompatibilities cause reproductive isolation, giving rise to rapid speciation events.
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| 16. | This preference could result in reproductive isolation if two populations came into contact again.
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| 17. | Furthermore, generally hybrids have reduced fitness which promotes reproductive isolation.
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| 18. | The evolution of reproductive isolation is a trickier thing.
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| 19. | Researchers consider reproductive isolation as key to speciation.
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| 20. | There is a continuum from total reproductive isolation ( no interbreeding ) to panmixis, unlimited interbreeding.
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