Winge’s sex-linked color patterns and SDL in the guppy: genes or gene complexes?
Journal Title: Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society - Year 2009, Vol 2, Issue 1
Abstract
In Poecilia reticulata, different phenotypes appear due to dominance, codominance, poligeny, or some demonstrated interallelic interactions. Recent (both molecular and classical) investigations suggest a mechanism of expression of several different loci in a single color pattern, resulting in high numbers of possible color pattern phenotypes. The color pattern seems to be determined by complex interactions of many genes (at the same locus or not, located on the same chromosome or not), under variable environmental conditions. For example, the Maculatus color pattern is due to the presence of both Maculatus red and Maculatus black elements. On their turn, having in view the latest definitions of the gene, both Maculatus red and Maculatus black could have a composite nature, too. Sexdetermination in the guppy is studied since the 1920s. The deepest mechanism of sex determination is not clear yet, but classical studies of Winge early in the past century and recent molecular studies revealed a possible composite nature of the so called master sex determining gene, located at SDL of the Y chromosome.
Authors and Affiliations
Valentin Petrescu-Mag
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