Biomaterial Database

Sex-chromosome segregation in inbred Drosophila melanogaster XXY females. I. Influence of closely related Y chromosome derivatives. 1990

B Palmgren

Department of Genetics, University of Stockholm, Sweden.

In tests of XXYder hybrids from two inbred lines of Drosophila melanogaster, a non-random distribution of various Yder chromosomes was found at regular X disjunction. This non-random Yder distribution was dependent on differences within the proximal X chromosome region (forked--centromere) of these particular lines, with a limited influence of the Yder,s. The Yder,s (originating from BsYy+ chromosome) showed a large influence on both level and brood pattern of secondary non-disjunction. There was no correlation between secondary non-disjunction and non-random Yder distribution, indicating different mechanisms. Cytological examination of the five Yder chromosomes disclosed no relation between the composition or configuration of the Yder,s and the observed distribution effects. Various parts of the present results show inconsistencies with either of the two existing segregation models (Grell, Novitski), suggesting that the mechanistic understanding of the meiotic process requires additional assumptions and/or alternatives.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D008540	Meiosis	A type of CELL NUCLEUS division, occurring during maturation of the GERM CELLS. Two successive cell nucleus divisions following a single chromosome duplication (S PHASE) result in daughter cells with half the number of CHROMOSOMES as the parent cells.	M Phase, Meiotic,Meiotic M Phase,M Phases, Meiotic,Meioses,Meiotic M Phases,Phase, Meiotic M,Phases, Meiotic M
D009630	Nondisjunction, Genetic	The failure of homologous CHROMOSOMES or CHROMATIDS to segregate during MITOSIS or MEIOSIS with the result that one daughter cell has both of a pair of parental chromosomes or chromatids and the other has none.	Genetic Non-Disjunction,Genetic Nondisjunction,Non-Disjunction, Genetic,Genetic Non Disjunction,Genetic Non-Disjunctions,Genetic Nondisjunctions,Non Disjunction, Genetic,Non-Disjunctions, Genetic,Nondisjunctions, Genetic
D002871	Chromosome Banding	Staining of bands, or chromosome segments, allowing the precise identification of individual chromosomes or parts of chromosomes. Applications include the determination of chromosome rearrangements in malformation syndromes and cancer, the chemistry of chromosome segments, chromosome changes during evolution, and, in conjunction with cell hybridization studies, chromosome mapping.	Banding, Chromosome,Bandings, Chromosome,Chromosome Bandings
D003433	Crosses, Genetic	Deliberate breeding of two different individuals that results in offspring that carry part of the genetic material of each parent. The parent organisms must be genetically compatible and may be from different varieties or closely related species.	Cross, Genetic,Genetic Cross,Genetic Crosses
D004331	Drosophila melanogaster	A species of fruit fly frequently used in genetics because of the large size of its chromosomes.	D. melanogaster,Drosophila melanogasters,melanogaster, Drosophila
D005260	Female		Females
D005838	Genotype	The genetic constitution of the individual, comprising the ALLELES present at each GENETIC LOCUS.	Genogroup,Genogroups,Genotypes
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D014960	X Chromosome	The female sex chromosome, being the differential sex chromosome carried by half the male gametes and all female gametes in human and other male-heterogametic species.	Chromosome, X,Chromosomes, X,X Chromosomes