Abstract
We have examined the meiosis of North American and Asian races of Lymantria dispar (L.) and their hybrids. The 31 prophase bivalents differ in size but bear few physical characteristics that allow a karyotype. Gypsy moth females are the heterogametic sex, and we suggest possible elements of the ZW pair. The meiotic prophases are achiasmate, but the chromosomes are tightly synapsed throughout prophase. A diffuse stage occurs, during which some chromosomes bear chromomeres. Male prophases are chiasmate. Meiosis of interracial hybrid females are normal and do not show evidence of heteromorphic bivalents, inversions, or translocations. Division anomalies are prevalent in the males, most anaphase figures representing unbalanced segregations. These observations are discussed in relation to efforts to characterize the gypsy broth genome.
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