Search results for "Chromosomal polymorphism"

showing 3 items of 13 documents

Chromosomal polymorphism associated with Robertsonian fusion in Seriola dumerili (Risso, 1810) (Pisces: Carangidae)

1986

The diploid numbers 2n= 48, and 2n= 47 have been determined for the greater amberjack, Seriola dumerili. A chromosome polymorphism due to Robertsonian fusion is present in this species. A simple sex-determining mechanism has not been observed.

Geneticsmedicine.medical_specialtybiologyCytogeneticsKaryotypeKaryotype - greater amberjack - chromosomal polymorphismAquatic Sciencebiology.organism_classificationSeriola dumeriliCarangidaemedicineChromosomal polymorphismPloidyAmberjackEcology Evolution Behavior and Systematics
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Chromosomal polymorphism and patterns of viability in natural populations of Drosophila melanogaster from cellar and vineyard.

1991

Two neighbouring natural populations of Drosophila melanogaster have been analysed, one from a cellar habitat and the other from a vineyard outside. An extensive study of inversion polymorphism in the two populations has been carried out. Furthermore, the relationship between inversion polymorphism and the viability of the second chromosome has been studied. The data regarding the total frequency of inversion-carrying chromosomes indicate a lower frequency in the cellar population than in the vineyard population. Some possibilities that could explain the behaviour of the chromosomes from the cellar in relation to the peculiar environment of this habitat are discussed. New endemic inversions…

Malemedicine.medical_specialtyHeterozygotePopulationPopulation geneticsBiologyVineyardGene FrequencyGeneticsmedicineChromosomal polymorphismAnimalseducationAllele frequencyGenetics (clinical)Crosses GeneticChromosomal inversionGeneticseducation.field_of_studyAnalysis of VariancePolymorphism GeneticHomozygoteCytogeneticsKaryotypeDrosophila melanogasterEvolutionary biologySpainChromosome InversionFemaleHeredity
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Patterns of Puffing Activity in the Polytene Chromosomes of Drosophila Subobscura

1982

The puffs and Balbiani rings are the visible expression of sites of genetic activity (Beerman, 1952). Since Beermann’s original hypothesis, puffing patterns for several species of Diptera have been described. Thus for the genus Drosophila, Ashburner (1967, 1969a and 1969b) has reported the puffing pattern of Drosophila melanogaster and Drosophila simulans, Beredens (1965) of Drosophila hydei, and Moriwaki and Ito (1969) of Drosophila ananassae. In a previous paper Frutos and Latorre (1981) have determined puffing patterns of the J and U chromosomes of Drosophila subobscura. This species shows a rich chromosomal polymorphism and the puffing pattern of several chromosomal rearrangements of th…

animal structuresPolytene chromosomebiologyEvolutionary biologyBalbiani RingsDrosophila ananassaefungiDrosophila hydeiChromosomal polymorphismDrosophila melanogasterDrosophila (subgenus)biology.organism_classificationDrosophila subobscura
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