S. E. Johnston
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Sex-dependent dominance at a single locus maintains variation in age at maturity in salmon
Males and females share many traits that have a common genetic basis; however, selection on these traits often differs between the sexes, leading to sexual conflict. Under such sexual antagonism,… Expand
Genome-wide association mapping identifies the genetic basis of discrete and quantitative variation in sexual weaponry in a wild sheep population.
Understanding the genetic architecture of phenotypic variation in natural populations is a fundamental goal of evolutionary genetics. Wild Soay sheep (Ovis aries) have an inherited polymorphism for… Expand
Variation in recombination frequency and distribution across eukaryotes: patterns and processes
- J. Stapley, P. G. Feulner, S. E. Johnston, A. Santure, C. Smadja
- Medicine, Biology
- Philosophical Transactions of the Royal Society B…
- 6 November 2017
Recombination, the exchange of DNA between maternal and paternal chromosomes during meiosis, is an essential feature of sexual reproduction in nearly all multicellular organisms. While the role of… Expand
Conserved Genetic Architecture Underlying Individual Recombination Rate Variation in a Wild Population of Soay Sheep (Ovis aries)
Meiotic recombination breaks down linkage disequilibrium (LD) and forms new haplotypes, meaning that it is an important driver of diversity in eukaryotic genomes. Understanding the causes of… Expand
Life history trade-offs at a single locus maintain sexually selected genetic variation
Sexual selection, through intra-male competition or female choice, is assumed to be a source of strong and sustained directional selection in the wild. In the presence of such strong directional… Expand
Genome-wide SNP analysis reveals a genetic basis for sea-age variation in a wild population of Atlantic salmon (Salmo salar).
Delaying sexual maturation can lead to larger body size and higher reproductive success, but carries an increased risk of death before reproducing. Classical life history theory predicts that… Expand
Horn type and horn length genes map to the same chromosomal region in Soay sheep
- S. E. Johnston, D. Beraldi, A. McRae, J. Pemberton, J. Slate
- Biology, Medicine
- 1 February 2010
The evolution of male weaponry in animals is driven by sexual selection, which is predicted to reduce the genetic variability underlying such traits. Soay sheep have an inherited polymorphism for… Expand
Butterfly speciation and the distribution of gene effect sizes fixed during adaptation
Mimicry has had a significant historical influence as a tractable system for studying adaptation and is known to play a role in speciation. Here, we discuss recent theoretical treatment of adaptive… Expand
Genome mapping in intensively studied wild vertebrate populations.
Over the past decade, long-term studies of vertebrate populations have been the focus of many quantitative genetic studies. As a result, we have a clearer understanding of why some fitness-related… Expand
Effect of manipulating recombination rates on response to selection in livestock breeding programs
- M. Battagin, G. Gorjanc, A. Faux, S. E. Johnston, J. Hickey
- Biology, Medicine
- Genetics Selection Evolution
- 22 June 2016
BackgroundIn this work, we performed simulations to explore the potential of manipulating recombination rates to increase response to selection in livestock breeding programs.MethodsWe carried out… Expand