The situation whereby individuals of a normally hermaphrodite species produce only female gametes.
 Example sentencesExamples
-  Direct evidence of the interaction between nuclear and mitochondrial genes comes from the study of cytoplasmic male sterility.
 -  Null 2 mutations result in defects in gametogenesis that cause incompletely penetrant male sterility and complete female sterility.
 -  Restoration of cytoplasmic male sterility in most species, including studies in S. vulgaris, seems to involve a mixture of mostly dominant and some recessive alleles.
 -  We found that 10 out of 11 species crosses involving hybrid male sterility show Y chromosome effects in at least one direction of the cross.
 -  A strong reduction of cytoplasmic neutral genetic diversity is therefore expected in species experiencing cryptic dominant male sterility.