نتایج جستجو برای: asexual reproduction
تعداد نتایج: 69702 فیلتر نتایج به سال:
Holothuria leucospilota and Stichopus chloronotus are among the most widespread tropical sea cucumber species usually harvested for food medicine in Asian countries, which natural stocks have collapsed worldwide. Both can reproduce sexually asexually, a better understanding of their reproductive strategy provide useful information conservation purposes. To describe genetic structure diversity s...
Motivated by the cyclic pattern of reproductive regimes observed in some species of green flies (" aphids "), we simulate the evolution of a population enduring harsh seasonal conditions for survival. The reproductive regime of each female is also seasonal in principle and genetically acquired, and can mutate for each newborn with some small probability. The results show a sharp transition at a...
We study the genetic behaviour of a population formed by haploid individuals which reproduce asexually. The genetic information for each individual is stored along a bit-string (or chromosome) with L bits, where 0-bits represent the wild-type allele and 1-bits correspond to harmful mutations. Each newborn inherits this chromosome from its parent with some few random mutations: on average a fixe...
Biological invasions offer optimal scenarios to study evolutionary changes under contemporary timescales. After long-distance dispersal, exotic species have to cope with strong mate limitation, and shifts toward uniparental reproduction have been hypothesized to be selectively advantageous. Oxalis pes-caprae is a clonal tristylous species native to South Africa, and invasive in Mediterranean re...
RÉSUMÉ Philip V. MLADENOV Echinoderme Asexué Sexué Reproduction Environnement Department of Marine Science, University of Otago, PO Box 56, Dunedin, New Zealand. Received 30/03/95, in revised form 08/12/95, accepted 14/12/95. This review provides a brief update of the occurrence and adaptive significance of asexual reproduction in echinoderms. lt then focuses on the state of knowledge of biotic...
Although evolutionary transitions from sexual to asexual reproduction are frequent in eukaryotes, the genetic bases of such shifts toward asexuality remain largely unknown. We addressed this issue in an aphid species where both sexual and obligate asexual lineages coexist in natural populations. These sexual and asexual lineages may occasionally interbreed because some asexual lineages maintain...
The scleractinian coral Pocillopora damicornis type β is known to present a mixed reproduction mode: through sexual reproduction, new genotypes are created, while asexual reproduction insures their propagation. In order to investigate the relative proportion of each reproduction mode in P. damicornis type β populations from Reunion Island, Indian Ocean, clonal propagation along the west coast w...
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