GENE FLOW AND SELECTION IN A CLINE
نویسندگان
چکیده
منابع مشابه
Selection and gene flow on a diminishing cline of melanic peppered moths.
Historical datasets documenting changes to gene frequency clines are extremely rare but provide a powerful means of assessing the strength and relative roles of natural selection and gene flow. In 19th century Britain, blackening of the environment by the coal-fired manufacturing industry gave rise to a steep cline in the frequency of the black (carbonaria) morph of the peppered moth (Biston be...
متن کاملEstimates of selection and gene flow from measures of cline width and linkage disequilibrium in heliconius hybrid zones.
Hybrid zones can yield estimates of natural selection and gene flow. The width of a cline in gene frequency is approximately proportional to gene flow (sigma) divided by the square root of per-locus selection (square root of s). Gene flow also causes gametic correlations (linkage disequilibria) between genes that differ across hybrid zones. Correlations are stronger when the hybrid zone is narr...
متن کاملGene flow reverses an adaptive cline in a coevolving host-parasitoid interaction.
Many natural populations are characterized by clinal patterns of adaptation, but it is unclear how gene flow and environmental gradients interact to drive such clines. We addressed this question by directly manipulating dispersal and productivity in an experimental landscape containing a microbial parasitoid, the bacteriophage T7, and its host, the bacterium Escherichia coli. We observed that t...
متن کاملTesting for asymmetrical gene flow in a Drosophila melanogaster body-size cline.
Asymmetrical gene flow is an important, but rarely examined genetic parameter. Here, we develop a new method for detecting departures from symmetrical migration between two populations using microsatellite data that are based on the difference in the proportion of private alleles. Application of this approach to data collected from wild-caught Drosophila melanogaster along a latitudinal body-si...
متن کاملGene flow and selection in a two-locus system.
A model of gene flow and selection in two linked loci is analyzed. The problems considered are the effects of linkage on the clines in frequencies at the two loci and the role of gene flow in producing linkage disequilibrium between the loci. Also, the possible significance of linkage as a mechanism for permitting a population of "track" spatial changes in the environment is considered. The res...
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ژورنال
عنوان ژورنال: Genetics
سال: 1973
ISSN: 1943-2631
DOI: 10.1093/genetics/75.4.733