(040611 revised, 040611 created)
Scriber JM, Hagen RH, Lederhouse RC (1996).
Genetics of mimicry in the tiger swallowtail butterflies, Papilio glaucus and P. canadensis (Lepidoptera: Papilionidae).
Evolution (1996) 50: 222-236
The tiger swallowtail butterfly, Papilio glaucus, exhibits a female-limited polymorphism for Batesian mimicry; the Canadian tiger swallowtail, Papilio canadensis, lacks the mimetic (dark) form entirely. The species hybridize to a limited extent where their ranges overlap. Field collections and censuses indicate that mimetic females occur throughout the range of P. glaucus but at lowest frequencies in populations at the latitudinal edges of its geographic range such as the southernmost part of Florida and along the entire northern edge of its distribution from Massachusetts to Minnesota. Frequencies of mimetic females have remained relatively stable over time. Inheritance of the mimetic form is controlled primarily by two interacting sex-linked loci. The typical matrilineal pattern of inheritance in P. glaucus can be explained by polymorphism at a Y-linked locus, b. Analysis of P. glaucus X P. canadensis crosses has also revealed an X-linked locus, s, which controls the expression of the mimetic phenotype. The P. canadensis allele , scan, suppresses the mimetic phenotype in hybrid and backcross females. Results from more than 12 yr of rearing tiger swallowtails, including interspecies hybrids, indicate that the absence of mimetic P. canadensis females is due to both a high frequency of the "suppressing" allele scan and low frequency of the black-pigment-determining b+ allele. The frequency of scan (or other suppressing alleles of s) in P. glaucus populations outside the hybrid zone is low. Some males heterozygous at the s locus and some suppressed mimetic females occur within the hybrid zone. A simple genetic model predicts the frequency of daughters that differ in phenotype from their mothers.
Key words- Butterflies, geographic variation, hybridization, mimicry, Papilio canadensis, Papilio glaucus, sex linkage, wing-color dimorphism, x-chromosome modifier.
Papilio glaucus: English name: the tiger swallowtail butterfly. Japanese name: トラフアゲハ. 分布：アメリカ合衆国（インディアナ州）、
雌の黒色型は、アオジャコウアゲハ（Battus philenor）に擬態する。
Papilio canadensis: English name: the Canadian tiger swallowtail. Japanese name: カナダトラフアゲハ。
censuses:センサス、個体数調査。