AbstractIn much of its rangePapilio glaucusL. has two forms of female, black and yellow, and the gene controlling the colour pattern is on the Y chromosome. Thus black mothers produce only black daughters and yellow mothers produce yellow daughters. Reasons are given to explain the occasional exceptions to this rule. The black female form mimicsBattus philenor(L.), and an autosomal mutant is described inP.glaucuswhich is paralleled by a similar aberration in the model ‐ a possible example of a model ‘escaping’ from a mimic and the mimic ‘catching up’ at one step.Sex mosaics are readily seen in the black form ofglaucusfemales and a numberare described from the Strecker collection. The probable cytogenetic constitution of these aberrations is discussed.Hybrids are described betweenglaucusand its near relatives,P.rutulusLucas,P.eurymedonLucas andP.multicaudatusKirby. These crosses produce mainly males but, by the use of ecdysterone, females have been obtained in the cross between the black female form ofglaucusand the male
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