Unusual sex chromosome inheritance in six species of small ermine moths (Yponomeuta, Yponomeutidae, Lepidoptera)

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First meiotic division in females and males of Yponomeuta evonyrnellus (L.), Y. cagnagellus (Hiibner). Y. rnalinellus Zeller, Y. padellus (L), Y. rorellus (Hiibner) and Y. gigas Rebel was studied in the light microscope. In the heterogametic females the sex chromosomes were found to be associated in a sex chromosome trivalent. The sex chromosome trivalent, written AA W Z, consisted of a W‐chromosome translocated to an autosome to form an A w ‐chromosome, which was paired with the homologous auto‐some and the 2‐chromosome. In the homogametic males the two Z‐chromosomes were paired in a usual bivalent. The sex chromosome inheritance can be balanced in this way. The haploid chromosome number was n = 29 A + AA W Z in females and n = 30 A + ZZ in males, for all species examined. It is of interest to notice that the chromosome number of Y. rorellus earlier has been differently determined to be n = 29 for males. Especially in females the bivalents were observed to be nonhomologously associated at the telomeres during meiotic prophase.


External organisations
  • Lund University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Genetics
Original languageEnglish
Pages (from-to)259-265
Number of pages7
Issue number2
Publication statusPublished - 1988 Jan 1
Publication categoryResearch

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