Two bird species exhibit postzygotic isolation in that half of the hybrids formed between them are sterile.If Haldane's rule applies here,then the individuals that are sterile are likely to be

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Haldane's rule states that when there is postzygotic isolation between two species, the heterogametic sex (usually males) is more likely to be sterile or inviable. In this case, the sterile hybrids are likely to be male.

Two Bird Species Exhibit Postzygotic Isolation in That Half of the Hybrids