segregation distorter

segregation distorter

[‚seg·rə′gā·shən dis‚tȯr·dər]
(genetics)
An abnormality of meiosis which produces a distortion of the 1:1 segregation ratio of alleles in a heterozygote.
References in periodicals archive ?
For example, in Drosophila melanogaster, segregation distorter (SD), a meiotic drive system, results in transmission of the SD chromosome in vast excess over the normal S[D.
Abbreviations: CMS, cytoplasmic male sterility; ML, maximum likelihood; PCR, polymerase chain reaction; RAPD, random amplified polymorphic DNA: SD, segregation distorter.
A significant number of species which reproduce sexually are known to possess segregation distorter genes (SDs), which operate during meiosis, the process of cell division through which gametes (eggs and sperm) are created.
This seems a paradigmatic case of selection; having the trait of being a segregation distorter increases the chances of a bit of genetic material's being passed on through generations as compared with other genes without the trait.
14 Interestingly, it turns out that if we take the gene itself as a real biological system, then segregation distorter genes can be analysed into parts which have functions relative to the segregation distorter gene.
Paul Griffiths [1993] also discusses the bearing of segregation distorters on function ascription.
Chromosomes bearing the SD segregation distorter of D.
Experiments on the propagation of transposable elements and segregation distorters are the major focus of attention.
The competition between several sex-specific segregation distorters has never been modeled explicitly (but see Hartl 1970; Liberman 1991).
The analysis will reveal that the competition between segregation distorters has a number of surprising aspects.
Figure 2 shows more systematically for which segregation distorters stable coexistence is possible.
We conclude that complementation is a potent force enhancing the coexistence of segregation distorters and that coexistence of two distorters is only precluded if there is no complementation at all.