The postzygotic isolating mechanisms prevent successful interspecies hybridization because although fertilization may be considered as successful, the resulting hybrid offspring is unable to develop or reproduce.
The postzygotic isolating mechanisms are different evolutionary mechanisms that prevent the emergence of hybrid species by acting after fertilization and therefore they act on the offspring to avoid further reproduction of these individuals.
In conclusion, the postzygotic isolating mechanisms prevent successful interspecies hybridization because although fertilization may be considered as successful, the resulting hybrid offspring is unable to develop or reproduce.
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