Abstract
The presence or absence of a small elytral ridge in the ladybeetle Harmonia is controlled by a pair of alleles, that for the presence behaving as a simple dominant with a fairly high penetrance. There is a geographic gradient passing through the Japanese island chain in the frequencies of these genes. Significant temporal variations in the frequencies of the genes were observed in samples obtained at Suwa-Tatuno in Nagano Prefecture and at Hukuoka in Kyushu. The rates of temporal changes as well as the geographic gradient, suggest that the pertinent locus is of the heterotic type.
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