Sexual reproduction largely predominates in animals, however, indicating that this cost is outweighed by the genetic and/or ecological benefits of sexuality, including the acquisition of advantageous mutations occurring in different individuals and the elimination of deleterious mutations. But the evolution ...
Proliferation, dispersal and patterned aggregation of iridophores in the skin prefigure striped colouration of zebrafish Colour patterns are a striking feature of animals; they evolve rapidly and play an important role in natural as well as sexual selection. It has been propo... S Ajeet Pratap,...
The combined use of mitochondrial DNA markers and polymerase chain reaction (PCR) techniques has greatly enhanced evolutionary studies. These techniques have also promoted the discovery of mitochondrial-like sequences in the nuclear genomes of many animals. While the nuclear sequences themselves are inte...
摘要: Background Although sexual reproduction is dominant within eukaryotes, asexual reproduction is widespread and has evolved independently as a derived trait in almost all major taxa. How asexuality...关键词: MHC Sex-specific selection Heterozygosity advantage Alpine chamois ...
Clonal structure through space and time: High stability in the holothurian Stichopus chloronotus (Echinodermata) render this practice efficient, notably for fissiparous holothurians, which are some of the mobile animals able of asexual reproduction by transverse fission... A Pirog,P Gélin,A Bédie...
Yet combining animals from both ephemeral and permanent hydroperiods revealed a 26% increase in asexual female lifespan across seasons (23% decrease in the rate of aging) and a 56% increase in asexual fecundity, suggesting that maintenance in benign laboratory conditions leads to slower aging. ...
The switch to asexual reproduction thus did not provoke any significant acceleration of the rate of chromosomal evolution in Cobitis. Asexual animals described in other case studies reproduce ameiotically, while Cobitis hybrids described here produce eggs likely through modified meiosis. Therefore, our...
摘要: New analyses of genetic and morphological data reveal that the bdelloid rotifers, a famous asexual group, have diversified into distinct species and that sex is not a necessary condition for speciation.关键词: Animals Rotifera DNA Microscopy, Electron, Scanning Reproduction, Asexual Molecular ...
Female sexual traits were decayed even in recently derived asexuals, suggesting that trait changes following the evolution of asexuality, when they occur, proceed rapidly and are driven by selective processes rather than drift. 展开 关键词: Animals Reproduction, Asexual Multifactorial Inheritance Insects...
sequence divergence between two alleles of a protein-coding gene in an asexual individual will be greater than that in a sexual species by a factor of 2tu, where t is the number of generations since sexual reproduction was lost and u is the mutation rate per generation in the asexual ...