On the sex chromosome trivalent in some Lepidoptera females (original) (raw)

Abstract

In four of the moth species investigated, viz. Witlesia murana, Scoparia arundinata (Pyraloidea), Bactra furfurana and B. lacteana (Tortricoidea) the metaphase plates of the first meiotic division of their oocytes show a trivalent in addition to the normal bivalents. It evidently has its rise in a transverse break in one of the conjugated chromosomes. Two sex chromatin bodies can be seen in the female somatic cells of three of these species, whereas other species with a normal XY bivalent have only one. These two sex chromatin bodies are unequal in size, and their sizes bear approximately the same relation to each other as do those of the two smaller chromosomes of the trivalent. The “broken” chromosome is evidently the Y chromosome. The sex chromosome designation for the four above-mentioned species is thus XY1Y2 for the females and XX for the males. The sex chromosomes of the four species are among the biggest of the respective complements. This supports the view that the big chromosome to be found in several Lepidoptera species is the sex chromosome. It seems that in animals with holokinetic chromosomes an excessive fragmentation is hindered, at least in the case of the sex chromosomes, by its deleterious effect on the balance of sex-determining genes.

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Authors and Affiliations

1. Department of Genetics, University of Helsinki, Finland
   Esko Suomalainen

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Dedicated to Doctor Sally Hughes-Schrader on the occasion of her seventy-fifth birthday.

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Suomalainen, E. On the sex chromosome trivalent in some Lepidoptera females.Chromosoma 28, 298–308 (1969). https://doi.org/10.1007/BF00284928

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• Received: 12 September 1969
• Accepted: 12 September 1969
• Issue date: September 1969
• DOI: https://doi.org/10.1007/BF00284928

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