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• W2114125323 abstract "Abstract This paper tests four theories of the maintenance of genetic recombination using published chiasma frequencies of 194 plant species representing 15 families of angiosperms. The theories are that recombination is favoured by environmental unpredictability, by fluctuating selection, by mutational load or by sib-competition. The level of genetic recombination was approximated by recombination index and by the number of excess chiasmata. Both measures were higher in animal-dispersed than in other species and increased as dispersal distance decreased. This association was found at all taxonomic levels. Chiasma frequency was not associated with life span of the species. Recombination index was lower in perennial than in annual species, but the reverse trend was observed among genera. Number of chiasmata per bivalent tended to decrease as the number of chromosomes increased, but this association was statistically insignificant at all taxonomic levels. No association was found between number of chiasmata per cell and nuclear DNA content. These patterns did not support the theories that environmental unpredictability or fluctuating selection due to parasite pressure favour recombination, and they offered only very little support for the theory that recombination is favoured so that mutational load can be decreased. The only theory that was consistent with the observed data is the sib-competition theory, which suggests that genetic recombination is maintained so that the intensity of competition with sibs is reduced." @default.
• W2114125323 created "2016-06-24" @default.
• W2114125323 creator A5054347933 @default.
• W2114125323 date "1993-03-01" @default.
• W2114125323 modified "2023-10-06" @default.
• W2114125323 title "Ecological correlates of chiasma frequency and recombination index of plants" @default.
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• W2114125323 doi "https://doi.org/10.1111/j.1095-8312.1993.tb00889.x" @default.
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