نتایج جستجو برای: asexual reproduction

تعداد نتایج: 69702  

Journal: :The Journal of experimental biology 2017
Kenji Matsuura

One major advantage of sexual reproduction over asexual reproduction is its promotion of genetic variation, although it reduces the genetic contribution to offspring. Queens of social insects double their contribution to the gene pool, while overuse of asexual reproduction may reduce the ability of the colony to adapt to environmental stress because of the loss of genetic diversity. Recent stud...

Journal: :Physica A: Statistical Mechanics and its Applications 2001

Journal: :Journal of Experimental Zoology 1915

Journal: :Molecular biology and evolution 2010
Maurine Neiman Gery Hehman Joseph T Miller John M Logsdon Douglas R Taylor

Sexual reproduction is both extremely costly and widespread relative to asexual reproduction, meaning that it must also confer profound advantages in order to persist. One theorized benefit of sex is that it facilitates the clearance of harmful mutations, which would accumulate more rapidly in the absence of recombination. The extent to which ineffective purifying selection and mutation accumul...

Journal: :Journal of evolutionary biology 2016
A Fontcuberta García-Cuenca Z Dumas T Schwander

The continuous generation of genetic variation has been proposed as one of the main factors explaining the maintenance of sexual reproduction in nature. However, populations of asexual individuals may attain high levels of genetic diversity through within-lineage diversification, replicate transitions to asexuality from sexual ancestors and migration. How these mechanisms affect genetic variati...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2009
Marc T J Johnson Stacey D Smith Mark D Rausher

Despite the importance of plant-herbivore interactions to the ecology and evolution of terrestrial ecosystems, the evolutionary factors contributing to variation in plant defenses against herbivores remain unresolved. We used a comparative phylogenetic approach to examine a previously untested hypothesis (Recombination-Mating System Hypothesis) that posits that reduced sexual reproduction limit...

2003
Xiping Ma Jennifer E. Purcell Victor S. Kennedy Thomas J. Miller Jennifer Purcell Victor Kennedy

Title of Thesis: EFFECTS OF ENVIRONMENTAL FACTORS ON DISTRIBUTION AND ASEXUAL REPRODUCTION OF THE INVASIVE HYDROZOAN, MOERISIA LYONSI Xiping Ma, Master of Science, 2003 Thesis directed by: Professor Jennifer E. Purcell Professor Victor S. Kennedy Associate Professor Thomas J. Miller Marine, Estuarine, and Environmental Sciences Program University of Maryland, College Park The effects of tempera...

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