Swallowtail butterfly tiger swallowtail), Y-linkage determines whether the females are either wild-type (yellow and black) or melanic (dark melanin replaces the yellow background). This genetic difference stems from the fact that melanism is controlled by a single gene, which controls the level of dopamine in the organism. The enzyme BAS, which assists dopamine in producing the yellow pigmentation, normally found on the wings' background, is suppressed. Without the pigmentation, the butterfly appears mostly black (the melanic form) and is a Batesian mimic of "Battus philenor", the pipevine swallowtail. There are also "Papilio glaucus" that are not wholly black; several possess an intermediate
Swallowtail Lighthouse Museum since 1980, was returned to the site, where it is displayed on a new wooden deck near the keeper's house. The Swallowtail Keepers Society took over the lighthouse property in July 2013. Later that year, federal, provincial and municipal government grants and community fundraising resulted in over $200,000 "to build a boardwalk, improve the footbridge, produce marketing materials and cover project administrative costs at the iconic lighthouse". Swallowtail Lighthouse The Swallowtail Lighthouse is a Canadian lighthouse located on Grand Manan Island in the Bay of Fundy. It was the first lighthouse to be built on the island. It was