Using paternity analysis to measure effective pollen dispersal in plant populations
Article Abstract:
The reliability of paternity analysis in estimating mean effective pollen dispersal was evaluated. Pollen parents were inferred based on the degree of genetic relationship with the offspring alone or combined with data on the probability of mating with mother plants. Computer simulation showed that the mean distance between inferred males and mother plants could give reliable estimates of mean effective pollen dispersal under specified circumstances. Some conditions that affect the reliability of paternity analysis were discussed. The results have applications in studies on the role of gene dispersal through pollen on plant population genetic structure.
Publication Name: The American Naturalist
Subject: Earth sciences
ISSN: 0003-0147
Year: 1992
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Masking of mutations and the evolution of sex
Article Abstract:
The role of deleterious recessive alleles in the evolution of selfing and outcrossing was studied by using the masking model, which assumes that outcrossing masks mutations by keeping recessive alleles heterozygous. The incidence of outcrossing is due to a combination of three parameters, namely, the difference between selfers and outcrossers with respect to heterozygosity of offspring (masking ability), the fitness difference of heterozygous and homozygous offspring, and the probability that a selfer can purge its genome of mutations.
Publication Name: The American Naturalist
Subject: Earth sciences
ISSN: 0003-0147
Year: 1992
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The spatial scale of genetic differentiation in a hummingbird-pollinated plant: comparison with models of isolation by distance
Article Abstract:
The hypothesis that genetic correlations among animal-pollinated plants decrease with increasing distance was investigated in Ipomopsis aggregata by determining its inbreeding coefficient, or F(sub ST), analysis with spatial autocorrelation and electrophoretic analysis of leaves and flower buds. The spatial scale of genetic differentiation did not compare conclusively with models of isolation-by-distance. Some reasons for the discrepancy between theory and observations are discussed.
Publication Name: The American Naturalist
Subject: Earth sciences
ISSN: 0003-0147
Year: 1992
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