The evolution of self-fertilization and inbreeding depression in plants. ii. empirical observations.
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A bimodal distribution of outCrossing rates was observed for natural plant populations, with more primarily selfing and primarily outcrossing species, and fewer species with intermediate outcrossed rate than expected by chance.Abstract:
A bimodal distribution of outcrossing rates was observed for natural plant populations, with more primarily selfing and primarily outcrossing species, and fewer species with intermediate outcrossing rate than expected by chance. We suggest that this distribution results from selection for the maintenance of outcrossing in historically large, outcrossing populations with substantial inbreeding depression, and from selection for selfing when increased inbreeding, due to pollinator failure or population bottlenecks, reduces the level of inbreeding depression. Few species or populations are fixed at complete selfing or complete outcrossing. A low level of selfing in primarily outcrossing species is unlikely to be selectively advantageous, but will not reduce inbreeding depression to the level where selfing is selectively favored, particularly if accompanied by reproductive compensation. Similarly, occasional outcrossing in primarily selfing species is unlikely to regularly provide sufficient heterosis to maintain selection for outcrossing through individual selection. Genetic, morphological and ecological constraints may limit the potential for outcrossing rates in selfers to be reduced below some minimum level.read more
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Inbreeding depression and its evolutionary consequences
TL;DR: The evidence that the evolution of breeding systems of animals and plants has been significantly influenced by the occurrence of inbreeding depression is reviewed, and the contemporary genetic theory of inmarriage depression and heterosis and the experimental data concerning the strength of in breeding depression are considered.
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Correlation between Fitness and Genetic Diversity
David H. Reed,Richard Frankham +1 more
TL;DR: Concerns that the loss of heterozygosity has a deleterious effect on population fitness are strengthened and the IUCN designation of genetic diversity as worthy of conservation is supported.
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Pollination Syndromes and Floral Specialization
TL;DR: It is shown that pollination syndromes provide great utility in understanding the mechanisms of floral diversification and the importance of organizing pollinators into functional groups according to presumed similarities in the selection pressures they exert.
Journal ArticleDOI
The evolution of self-fertilization and inbreeding depression in plants. i. genetic models
TL;DR: Genetic models are constructed which allow inbreeding depression to change with the mean selfing rate in a population by incorporating both mutation to recessive and partially dominant lethal and sublethal alleles at many loci and mutation in quantitative characters under stabilizing selection.
Journal ArticleDOI
Evolution of the magnitude and timing of inbreeding depression in plants.
TL;DR: The hypothesis that most early acting inbreeding depression is due to recessive lethals and can be purged through inbreeding, whereas much of the late‐acting inbreeding depressions are due to weakly deleterious mutations and is very difficult to purge, even under extreme inbreeding is supported.
References
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The Evolution of Sex
TL;DR: In this paper, the authors compared the short-term advantages of sex and recombination in a finite population with the long-term consequences of recombination and sex and showed that recombination has shortterm advantages for both sexes.
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Evolution of sex
TL;DR: The Economy of Nature and the Evolution of Sex*.
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Evolution of sex
TL;DR: Understanding Homosexuality : Its Biological and Psychological Bases by J. A. Loraine.
Journal ArticleDOI
The evolution of self-fertilization and inbreeding depression in plants. i. genetic models
TL;DR: Genetic models are constructed which allow inbreeding depression to change with the mean selfing rate in a population by incorporating both mutation to recessive and partially dominant lethal and sublethal alleles at many loci and mutation in quantitative characters under stabilizing selection.