Abstract
Chiasma frequency and distribution were studied in Blattella asahinai Mizukubo and interspecific hybrid males from crosses of B. asahinai × B. germanica (L.). Observations were made on male meiocytes in late dialdnesis. Chiasmata were localized at or near the ends of the chromosomes in both species. Chiasma frequency was lower and less variable in B. asahinai than in B. germanica. In the interspecific hybrids, the frequency was closer to that of B. asahinai than B. germanica. Chiasmata in hybrids were redistributed into regions where chiasmata are rare in the parent species. Chiasma frequency and the range of variation in chiasma frequency and in the frequency of internal chiasmata were affected by the species of the maternal parent. The maternal influence may be the result of a nonreciprocal translocation that involves the X chromosome and that separates the two species.
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