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A New Look at Sex Determination in Poeciliid Fishes
TLDR
Of particular interest to geneticists are several cases of atypical sex determination in mammals, including humans, in which an autosomal gene causes the testicular differentiation of XX individuals, which has raised the question as to the location of the male-determining gene.
GENETIC BASIS FOR ALTERNATIVE REPRODUCTIVE TACTICS IN THE PYGMY SWORDTAIL, XIPHOPHORUS NIGRENSIS
TLDR
Observations suggest that the difference in mating behavior in the Río Coy population of Xiphophorus nigrensis is not an indirect developmental effect of size but, rather, is under direct genetic control.
The Platyfish, Xiphophorus maculatus
Fishes of the genus Xiphophorus (Poeciliidae, Atheriniformes) are found on the Atlantic slope of Mexico and adjacent parts of Central America.
The genus Xiphophorus in Mexico and central america.
TLDR
The genus Xiphophorus is found from northeastern Mexico for about 2200 Km as far as Honduras, and four monophyletic groups have been identified: the northern platyfish and the northern swordtails groups, north of the Mexican Trans Volcanic Axis, and to the south the helleri and the clemenciae swordtail groups.
Genetics of Melanomas in Xiphophorus Fishes
TLDR
Findings from studies on heritable melanoma formation in certain hybrids of Xiphophorus fishes stress the complexity of tumorigenesis and the heterogeneity of pathways that lead to cancers of the same histological type.
Estimation of nuclear DNA content by flow cytometry in fishes of the genus Xiphophorus.
TLDR
Estimation of nuclear DNA content in cells from 16 stocks representing 9 species of the genus Xiphophorus is of potential significance in connection with the genetics of sex determination and the study of taxonomic relationships.
A Sex-Linked Gene Controlling the Onset of Sexual Maturity in Female and Male Platyfish (XIPHOPHORUS MACULATUS), Fecundity in Females and Adult Size in Males.
A sex-linked gene, P, controls the onset of sexual maturity in the platyfish, Xiphophorus maculatus. The activity of this gene is correlated with the age and size at which the gonadotropic zone of
The Homozygosity of Clones of the Self-Fertilizing Hermaphroditic Fish Rivulus marmoratus Poey (Cyprinodontidae, Atheriniformes)
TLDR
Two clones of the hermaphroditic fish Rivulus marmoratus Poey, identified by their intraclonal histocompatibilities and interclonal histoincompatibility, were kept through successive uniparental generations, each fish in isolation to study the possible role of males in the prevalence of homozygous clones in the wild.
MAINTENANCE OF THE THREE SEX CHROMOSOME POLYMORPHISM IN THE PLATYFISH, XIPHOPHORUS MACULATUS
TLDR
A mathematical model derived the necessary and sufficient conditions for the maintenance of the sex chromosomal polymorphism in the platyfish, Xiphophorus maculatus, and concludes that the WY and WX females have higher fitnesses than both colored and wildtype XX females.
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