mei-9D2/mei-9A2 females show 29% X chromosome nondisjunction, compared to 0.33% in wild-type females. mei-9D2/mei-9A2 larvae are hypersensitive to ultraviolet light and nitrogen mustard.
Flies are sensitive to X rays.
Hemizygous male larvae are sensitive to HN2 and MMS. Homozygous females produce diplo-X and nullo-X exceptions at roughly the same frequency.
mutagen sensitive reduces exchange