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If such traits are absent in asexuals, simple growth efficiency considerations will not capture the fitness benefits gained by skipping sexual reproduction. This is equivalent to an absence of any cost of male production. First, the cost of males included a cost of diapause. In population genetic terms, this process leads to a randomization of allele frequencies and brings their distributions closer to linkage equilibrium. Both processes can increase homozygosity in offspring, which often results in reduced fitness of offspring owing to inbreeding depression—at least in the very first generations of a newly established asexual lineage. Lineage-Specific Factors A major problem in evolutionary biology is identifying the benefits of sex that are responsible for its maintenance in most eukaryotic species, or in other words, the factors that cause the failure of most asexual invasions at an early stage. Published online Jul In one of the models the local density of Q. DPReview Digital Photography. Meanwhile, it has been recognized that genome dilution can be highly relevant in the context of asexual hermaphrodites, but that it does not apply in most species with separate sexes 4. Lineage selection and the maintenance of sex. Because protists reproduce by mitotic division most of the time, the cost applies only to the short time periods toward the end of the growing season when sex is induced. Sexual conflict is only relevant as a factor in the cost of sex, if asexual females do not suffer from such costs. The cost of sex and competition between cyclical and obligate parthenogenetic rotifers. Ideally, to obtain a direct estimate of the combined cost of sex one would quantify the fitness ratio between clonal and sexual individuals of the same species in a common garden environment.

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Description: Another empirical challenge is to get a better estimate of the real costs of sex across the many eukaryotic lineages. Facing real-world complexities. In these models, an allele that suppresses recombination completely is only considered as a special case 8. Because protists reproduce by mitotic division most of the time, the cost applies only to the short time periods toward the end of the growing season when sex is induced. The maintenance of sex by group selection. In addition, a cost of syngamy and karyogamy might result in a longer duration of embryonic development of fertilized sexual eggs. For example, if asexuality is the result of a hybridization event, heterosis might influence fitness-related traits and might thus result in a higher lifetime reproduction of asexuals The simple Mendelian inheritance mechanism allows the generation of sexual lineages CP clones and asexual lineages OP clones with essentially the same genetic background. Isolation of a fast-growing strain of the rotifer Brachionus calyciflorus Pallas using turbidostat culture. Lineage-Specific Factors A major problem in evolutionary biology is identifying the benefits of sex that are responsible for its maintenance in most eukaryotic species, or in other words, the factors that cause the failure of most asexual invasions at an early stage. In population genetic terms, this process leads to a randomization of allele frequencies and brings their distributions closer to linkage equilibrium. Incidence and implications of individual specialization.
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