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Population Density, Outcrossing Rate, and Heterozygote Superiority in Ponderosa Pine

Michael A. Farris and Jeffry B. Mitton
Evolution
Vol. 38, No. 5 (Sep., 1984), pp. 1151-1154
DOI: 10.2307/2408448
Stable URL: http://www.jstor.org/stable/2408448
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Population Density, Outcrossing Rate, and Heterozygote Superiority in Ponderosa Pine
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Abstract

Seeds and seedlings were used to determine the outcrossing rate in a low-density stand of ponderosa pine. Maximum likelihood analysis of the electrophoretic data revealed an outcrossing rate of t = .81 for seeds from the low-density stand, which differed significantly from the outcrossing rate of t = .96 for a normal density stand. The seedlings were the remnant of a larger group which had experienced 35% mortality in the greenhouse. These seedlings had a significantly lower F than the seeds, which suggests that heterozygotes had a survival advantage over more homozygous individuals.

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