Sexual selection and the accumulation of deleterious mutations. Mutation is the ultimate source of all genetic variation. Understanding the nature of mutation, its frequency, the distribution of effects, and the forces of selection that remove mutational load from populations is therefore a central concern of genetics. The accumulation of mutational load in endangered species and in human populations, where the forces of selection tend not to operate, has the potential to create serious proble ....Sexual selection and the accumulation of deleterious mutations. Mutation is the ultimate source of all genetic variation. Understanding the nature of mutation, its frequency, the distribution of effects, and the forces of selection that remove mutational load from populations is therefore a central concern of genetics. The accumulation of mutational load in endangered species and in human populations, where the forces of selection tend not to operate, has the potential to create serious problems. We will determine the efficacy of sexual selection in preventing deleterious mutations from accumulating in populations. This project will provide research training opportunities in quantitative genetics, an enabling discipline in Biology.Read moreRead less
The Maintenance of Genetic Variation by Antagonistic Sexual Selection. The principle outcomes of my proposed research are fundamental knowledge, training of young scientists and the improvement of Australia's research capacity and profile. My research will have a major impact on two major branches of evolutionary biology that are seldom integrated - sexual selection and quantitative genetics. My research will enable me to establish myself as an independent researcher. Moreover, my collaborations ....The Maintenance of Genetic Variation by Antagonistic Sexual Selection. The principle outcomes of my proposed research are fundamental knowledge, training of young scientists and the improvement of Australia's research capacity and profile. My research will have a major impact on two major branches of evolutionary biology that are seldom integrated - sexual selection and quantitative genetics. My research will enable me to establish myself as an independent researcher. Moreover, my collaborations with one of the leading research laboratories in the UK, will teach me several modern techniques that I can disseminate to Australian students participating on the proposed project.Read moreRead less
Putting sexual selection in a life-history context: What is meant by genetic quality? Theories of sexual signalling have been developed largely without reference to life-history theory and quantitative genetics. We will test recent theory that shows the costs of signals are best measured in units of future survival and reproduction. In a series of field and laboratory experiments on the cricket Teleogryllus commodus, we will test the idea that the "male genetic quality" referred to by good-genes ....Putting sexual selection in a life-history context: What is meant by genetic quality? Theories of sexual signalling have been developed largely without reference to life-history theory and quantitative genetics. We will test recent theory that shows the costs of signals are best measured in units of future survival and reproduction. In a series of field and laboratory experiments on the cricket Teleogryllus commodus, we will test the idea that the "male genetic quality" referred to by good-genes models of sexual selection is quality in the general ability to acquire resources, rather than in how resources are allocated among fitness components.Read moreRead less
Sex and mutations - testing the genic capture hypothesis. The proposed project will use a novel method to test a major outstanding theoretical problem in evolutionary biology and behavioural ecology. This will strengthen Australian research in this field and contribute to the growing international recognition it currently receives. The new methods developed will be useful to other researchers interested in mutation, sexual selection and the evolution and maintenance of sex. Part of the project w ....Sex and mutations - testing the genic capture hypothesis. The proposed project will use a novel method to test a major outstanding theoretical problem in evolutionary biology and behavioural ecology. This will strengthen Australian research in this field and contribute to the growing international recognition it currently receives. The new methods developed will be useful to other researchers interested in mutation, sexual selection and the evolution and maintenance of sex. Part of the project will be conducted in collaboration with a leading researcher in the UK. This will strengthen the links between institution in Australia and the UK.Read moreRead less
The Geometry of Genetic Limits to Evolutionary Change. Genetic limits to evolutionary change are a fundamental issue for plant and animal improvement, as well as understanding how natural populations may respond to human-induced changes such as habitat degradation and climate change. Because we still know very little about how genetic variation is distributed among the multiple traits that are likely to respond to selection in such circumstances, we have no way of directly measuring the evoluti ....The Geometry of Genetic Limits to Evolutionary Change. Genetic limits to evolutionary change are a fundamental issue for plant and animal improvement, as well as understanding how natural populations may respond to human-induced changes such as habitat degradation and climate change. Because we still know very little about how genetic variation is distributed among the multiple traits that are likely to respond to selection in such circumstances, we have no way of directly measuring the evolutionary potential of any natural population. In this proposal, we develop the theory, statistical tools, and experimental designs to investigate the nature and prevalence of these multivariate genetic constraints.Read moreRead less
Nanotechnology in nature: the evolutionary significance of iridescent ultraviolet colouration in butterflies. Nanostructural colour is a novel and interesting biological phenomenon that has potential application in textile and paint industries. This research has the potential to uncover knowledge relevant to future genetic manipulation and/or artificial synthesis of this trait for industry. Fundamental benefits will include a contribution to our understanding of evolution and biological diversit ....Nanotechnology in nature: the evolutionary significance of iridescent ultraviolet colouration in butterflies. Nanostructural colour is a novel and interesting biological phenomenon that has potential application in textile and paint industries. This research has the potential to uncover knowledge relevant to future genetic manipulation and/or artificial synthesis of this trait for industry. Fundamental benefits will include a contribution to our understanding of evolution and biological diversity, enhancement of Australia's research profile, and the cultivation of new scientific expertise. This proposal also promises to benefit the Australian scientific community through the establishment of collaborative links with universities in the USA and UK, and to increase mainstream awareness of Australia's stunning natural resources.Read moreRead less
Identification of genetic polymorphisms of synaptically expressed genes that contribute to variation in normal brain function. This project focuses on understanding brain functions. Brain and mind disorders are by far the largest contributors to the burden of disability, far exceeding any other disorder. This research will contribute to knowledge through addressing the national research priority promoting and maintaining good health. The research outcomes will form the scientific knowledge base ....Identification of genetic polymorphisms of synaptically expressed genes that contribute to variation in normal brain function. This project focuses on understanding brain functions. Brain and mind disorders are by far the largest contributors to the burden of disability, far exceeding any other disorder. This research will contribute to knowledge through addressing the national research priority promoting and maintaining good health. The research outcomes will form the scientific knowledge base essential for the translation of the project into public benefit through their application in development of new testing paradigms for a range of brain and mind disorders. Read moreRead less
Searching for genes influencing reading ability using multivariate genomic linkage analysis and allelic association analysis. Following from the replicated linkages of reading disability to loci on chromosomes 6 & 18, this study examines linkage of these same regions to a range of reading measures in an unselected sample of twins and siblings. Preliminary univariate linkage scans of two neuropsychological reading indices suggest linkage to loci on two chromosomes. Our next step is to include rea ....Searching for genes influencing reading ability using multivariate genomic linkage analysis and allelic association analysis. Following from the replicated linkages of reading disability to loci on chromosomes 6 & 18, this study examines linkage of these same regions to a range of reading measures in an unselected sample of twins and siblings. Preliminary univariate linkage scans of two neuropsychological reading indices suggest linkage to loci on two chromosomes. Our next step is to include reading measures of orthographic skill and phonological decoding in a multivariate linkage analysis with the other reading indices and with measures of IQ and academic achievement. Multivariate linkage increases the power of detecting quantitative traits and assists in defining the phenotype related to the locus. We then aim to identify the functional gene through allelic association analysis. Identification of QTLs for reading ability may lead to practical outcomes such as the behavioural and biomedical management of reading deficits, which may then benefit areas such as scholastic achievement.Read moreRead less
Locating genes for elementary and complex cognitive abilities using genetic linkage and association analysis. This study aims to identify genes influencing cognitive ability by using multiple measures of cognition in combination with genetic linkage and association analyses. Multiple measures can increase the statistical power of finding a gene and provide a more comprehensive framework for charting the functional role of genes. The outcome of locating genes for cognition will provide insight i ....Locating genes for elementary and complex cognitive abilities using genetic linkage and association analysis. This study aims to identify genes influencing cognitive ability by using multiple measures of cognition in combination with genetic linkage and association analyses. Multiple measures can increase the statistical power of finding a gene and provide a more comprehensive framework for charting the functional role of genes. The outcome of locating genes for cognition will provide insight into biological functions of the brain which affect human intellect, and will have downstream practical applications which could include better educational, behavioural and biomedical management of learning and memory disorders, and of other intellectual disabilities.Read moreRead less
Quantitative and Molecular Genetic Analysis of Cognition. This study attempts to unravel the pathways through which genes may exert their influence on cognitive processes by identifying some of the genes associated with normal variation in cognitive ability. Using the cognitive phenotypes we have collected, both linkage and association analysis will be used to find QTLs (locations on the chromosomes at which specific genes contribute to a quantitative trait) associated with processing speed and ....Quantitative and Molecular Genetic Analysis of Cognition. This study attempts to unravel the pathways through which genes may exert their influence on cognitive processes by identifying some of the genes associated with normal variation in cognitive ability. Using the cognitive phenotypes we have collected, both linkage and association analysis will be used to find QTLs (locations on the chromosomes at which specific genes contribute to a quantitative trait) associated with processing speed and other specific abilities. The research will enhance our understanding of the biological mechanisms influencing brain function and paves the way for the genetic dissection of the brain.Read moreRead less