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Examples of nondysgenic and dysgenic female reproductive tracts from conspecific and heterospecific F1s. (A) Nondysgenic ♀M/♂M D. simulans/D. simulans F1 female. (B) Nondysgenic ♀M/♂M F1 D. mauritiana female. (C) Dysgenic ♀M/♂P D. simulans/D. simulans F1 female. (D) Dysgenic ♀M/♂P D. mauritiana/D. simulans F1 female. Both ♀M/♂P females (C and D) have only one functional ovary.
