Hereditary Basis of Melanosis in Hybrid Fishes
نویسنده
چکیده
In reviewing the work on the generic hybrids between Platypoecilus maculatus and X iphophorus hellerii, one is confronted by evidence which seems to point to a definite correlation between melanotic conditions in the hybrid fishes and their characteristic color pattern. In some cases, normal and pathological hybrids occur together in the same brood, born and reared in the same aquarium. But it is only in hybrids of certain specific color patterns that melanosis appears. Since the various color patterns have been shown to be heritable, the evidence seems to indicate that heredity plays an important r6le in determining the physical condition of each generic hybrid. Abnormal conditions in certain hybrids were recognized by the early fish hybridizers, Losslein (1912) and Haffner (1912). It is only recently (1928) that a confirmatory note, with respect to the origin of the pathological conditions arising under controlled breeding practices, has been presented by Haussler, writing from the Institut fUr experimentelle Krebsforschung, Heidelberg. His results and interpretation agree in the more important details with those of Kosswig (1928, 1929). Experiments in hybridization have been in progress at Cornell University since 1925, but the major part of the genetic work has
منابع مشابه
Congenital diffuse Melanosis in a father and two sons
Congenital diffuse Melanosis is one of the rarest clinical manifestations of hereditary universal Melanosis and only few cases have been reported all over the world. The presented case is a 54-year-old man who presented to us complaining of erythematous annular lesions on his face and neck since 8 months ago. Diffuse pigmentation of his skin took our attention. According to the patient, d...
متن کاملThe Morphology of Melanotic Over-growths in Hybrids of Mexican Killifishes
Genetic studies of hybrids between the Mexican killifishes, Platypoecilus maculatus and Xiphophorus hellerii, have shown that when the black-spotted varieties of Platypoecilus are crossed with Xiphophorus, melanosis appears in some of the hybrid offspring. The distinguishing feature of these black-spotted varieties of Platypoecilus is the presence in the skin of a large type of black chromatoph...
متن کاملFrictional melanosis and its clinical and histopathological features
Background: A rippled type of pigmentation is observed on the arms, forearms, and bony prominences, more commonly in women with a history of chronic rubbing. The terminology (commonly referred to as frictional melanosis) and its relation with cutaneous amyloidosis has been debated. Materials and Methods: Twenty one patients with pigmented skin lesions with manifestations suggestive of frictiona...
متن کاملEffects of genistein on melanosis and microbial quality of Litopenaeus vannamei during ice storage
Utilization of genistein as a natural inhibitor was studied alone and in combination with conventional treatments on melanosis and microbial quality of fresh L. vannamei during 10 days ice storage. Treatments were as followed: A (dipping samples in distilled water), B (dipping in 1.25 % sodium metabisulphite solution), C (dipping in 0.01 % genistein + 2% glycerol solution), D (dipping in 0.1 % ...
متن کامل