Summary
In small dioecious populations there will frequently be a numerical excess of one sex. It is argued that a gene for hermaphroditism will spread in such conditions. The strength of selection for such a gene is inversely proportional to the population number.
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Manning, J. Hermaphroditism and the sampling-error model. Heredity 50, 91–93 (1983). https://doi.org/10.1038/hdy.1983.10
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DOI: https://doi.org/10.1038/hdy.1983.10