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Cell Lineage Analyses and Gene Function Studies Using Twin-spot MARCM
Published on: March 2, 2017
Selection components in background replacement lines of Drosophila.
1Department of Biology, Pennsylvania State University, University Park, Pennsylvania 16802.
Genetics
|September 1, 1984
Summary
Genetic analysis in Drosophila melanogaster reveals fitness determinants. Differences in genetic backgrounds attributed to linkage disequilibrium disappeared after 20 generations of backcrossing.
Area of Science:
- * Evolutionary genetics and population genetics.
- * Study of genetic variation and fitness in natural populations.
Background:
- * Analysis of selection components in Drosophila melanogaster.
- * Utilized inbred isofemale lines from natural California populations.
- * Included lines with the 'eagle' spread wing mutation.
Purpose of the Study:
- * To analyze aspects of the genetic structure of fitness determinants.
- * To investigate changes in marginal fitnesses associated with the 'eagle' locus.
- * To understand the role of genetic background and linkage disequilibrium in fitness.
Main Methods:
- * Selection components analysis performed at three time points during backcrossing.
- * Substitution backcrossing employed to assess genetic background effects.
- * Bootstrapping method utilized for statistical confidence in selection components.
Main Results:
- * Observed changes in marginal fitnesses of the 'eagle' locus.
- * Differences among genetic backgrounds diminished by the 20th generation of backcrossing.
- * Previously observed fitness differences were attributable to linkage disequilibrium.
Conclusions:
- * Linkage disequilibrium significantly influences fitness components in early generations.
- * Genetic background effects on fitness largely resolved after extensive backcrossing.
- * Bootstrapping provides a robust statistical framework for selection component analysis.
