Colour inheritance and sex determination in Lebistes

Abstract

the male is provided with beautiful red, yellow and black spots and configurations on the body and often on the dorsal and caudal fins too; the caudal fin may also be elongated. The studies carried out on Lebistes concern the inheritance of the colour pattern and sex determination. Lebistes reticulatus has the male with XY and the female with XX. It was the first organism in which a Y-linked inheritance was demonstrated (Schmidt, 1920 Winge, 1921) ; two rather different colour patterns, Ir and Ma, were found on crossing two strains continually to be transmitted from father to son, grandson and so on, and never to be inherited X through the mother. Subsequently by thorough genetic analysis more than 20 fl colour genes have been demonstrated

Biased sex ratios in laboratory strains of guppies, Poecilia reticulata

“…Although the major sex-determining genes are on the sex chromosomes, an accumulation of autosomal sex-determining genes can result in sex reversals, i.e., XY females and XX males (Winge, 1930(Winge, , 1934. YY males heterozygotic for Y-linked colour patterns are viable and fertile (Winge, 1934;Winge and Ditlevsen, 1947; the present study), but a recessive lethal prevents production of YY homozygotes (Winge and Ditlevsen, 1938;Haskins et al, 1970). The Y-chromosome is not inert.…”

“…A majority of male secondary sexual colour patterns are Y-linked (Haskins et al, 1961, and reviews by Winge and Ditlevsen, 1947;Dzwillo, 1959;Yamamoto, 1975), and level of male sexual activity is also apparently primarily Y-linked (Farr, in prep.). The data presented below allow one to answer the following questions:…”

Linkage Analysis Reveals the Independent Origin of Poeciliid Sex Chromosomes and a Case of Atypical Sex Inheritance in the Guppy (Poecilia reticulata)

“…Guppies are live bearers that display a pronounced sexual dimorphism for body size and for nuptial ornaments that are expressed exclusively in mature males. A substantial fraction of the ornamental genes is faithfully transmitted from father to son in every generation and may therefore represent maleadvantageous genes linked to the SDL on Y in wild guppies (Winge 1927;Winge and Ditlevsen 1947;Haskins et al 1970). Another set of ornamental genes can be maternally inherited, but their expression is largely limited to the sons.…”

PADRONIZAÇÃO DE UMA METODOLOGIA PARA A ANÁLISE CITOGENÉTICA DE UMA LINHAGEM SELECIONADA DE LEBISTE (Poecilia reticulata)

“…Existe evidência genética de extensa base de um sistema de determinação do sexo XY em guppy, sugerindo que uma região limitada, não-recombinante do cromossomo Y do guppy abriga o lócus do sexo masculino, determinante na ligação genética relativa para machos e genes ornamentais vantajosos (Winge 1922(Winge a, b, 1927Winge & Ditlevsen 1947;Haskins et al 1970). Os marcadores definem 23 grupos de enlace, que correspondem ao número haplóide conhecido de cromossomos da espécie (Tripathi, 2008).…”