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Chromosomes in two bug species of Hebrus (Hebridae, Heteroptera). The occurrence of neo-XY sex chromosome system in Heteroptera
Tekijät: Nokkala S, Nokkala C
Kustantaja: UNIV FLORENCE BOTANY INST
Julkaisuvuosi: 1999
Lehti:: Caryologia
Tietokannassa oleva lehden nimi: CARYOLOGIA
Lehden akronyymi: CARYOLOGIA
Vuosikerta: 52
Numero: 1-2
Aloitussivu: 27
Lopetussivu: 30
Sivujen määrä: 4
ISSN: 0008-7114
DOI: https://doi.org/10.1080/00087114.1998.10589150
Tiivistelmä
Chromosomes in two species in the genus Hebrus (Hebridae, Heteroptera) mere studied. The species H. ruficeps (Th.) showed the chromosome number 2n = 22A + XY with achiasmate sex chromosomes, which divided in the first meiotic division and separated from one another at the second division. H. pusillus (Fn.) displayed 2n = 22A + neo-XY. The chromosomes of the neo-XY bivalent separated prereductionalIy in the first division. Both species lacked m-chromosomes. It was suggested that although the XY sex chromosome system prevails in Heteroptera, the formation of the neo-XY system has taken place in an XO ancestor after the loss of the Y chromosome.
Chromosomes in two species in the genus Hebrus (Hebridae, Heteroptera) mere studied. The species H. ruficeps (Th.) showed the chromosome number 2n = 22A + XY with achiasmate sex chromosomes, which divided in the first meiotic division and separated from one another at the second division. H. pusillus (Fn.) displayed 2n = 22A + neo-XY. The chromosomes of the neo-XY bivalent separated prereductionalIy in the first division. Both species lacked m-chromosomes. It was suggested that although the XY sex chromosome system prevails in Heteroptera, the formation of the neo-XY system has taken place in an XO ancestor after the loss of the Y chromosome.
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