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Achiasmatic male meiosis in two species of Saldula (Saldidae, Hemiptera).
Male meiosis in two species of Saldula, S. orthothila and S. saltatoria was studied and the existence of a Y-chromosome was recorded for the first time in this primitive heteropteran genus, found to be similar to that of sex chromosomes in more advanced Heteroptera.
Holocentric chromosomes in meiosis. I. Restriction of the number of chiasmata in bivalents
- S. Nokkala, V. Kuznetsova, A. Maryańska-Nadachowska, C. Nokkala
- Biology, MedicineChromosome Research
The elimination of the cells carrying bivalents with more than two chiasmata creates a strong selection against the formation of more than one chiasma loops in holocentric bivalENTs.
Cytogenetics of the true bug infraorder Cimicomorpha (Hemiptera, Heteroptera): a review
A review of essential cytogenetic characters of the Cimicomorpha is presented and the chief objectives and goals of future investigations in the field are outlined.
Mitotic and meiotic chromosomes in Somatochlora metallica (Cordulidae, Odonata). The absence of localized centromeres and inverted meiosis.
Meiosis in these male dragonflies is thus pre-reductional or conventional, not post-red reductional or inverted, as has been previously proposed, and the kinetic behaviour of the chromosomes both in mitosis and meiosis showed that they were holocentric.
Achiasmatic male meiosis in the Heteropteran genus Nabis (Nabidae, Hemiptera)
The cytology of Nabis is characterized by the lack of telokinetic activity of chromosomes in male meiosis, the presence of interkinesis stage, the nonradiality of the first metaphase plate and the radiality of this plate, and the distance pairing of the sex chromosomes instead of the usual touch-and-go pairing at second metaphase.
Chromosomes in two bug species of Hebrus (Hebridae, Heteroptera). Tbe occurrence of neo-XY sex chromosome system in Heteroptera
It was suggested that although the XY sex chromo some 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.
Species and habitat races in the chrysomelid Galerucella nymphaeae species complex in northern Europe
By analyzing chromosomal polymorphisms in sympatric populations of G. nymphaeae and G. sagittariae, it was shown that the two species do not hybridize in nature, supporting the possibility that a sympatrics mode of divergence has been involved in habitat race formation and speciation in the species complex.
The occurrence of the X0 sex chromosome system in Dictyonota tricornis (Schr.) (Tingidae, Hemiptera and its significance for concepts of sex chromosome system evolution in Heteroptera
Chromosome numbers and chromosomal polymorphism in Finnish species of Galerucella Crotch (Chrysomelidae, Coleoptera)
The conclusion is made that the forms of G. nymphaeae living on aquatic and terrestrial plants are reproductively isolated, and the species studied were found to carry B-chromosomes of their own type, excluding G. sagittariae, where B- chromosomes appeared to be similar.
The absence of chiasma terminalization and inverted meiosis in males and females of Myrmus miriformis Fn. (Corizidae, Heteroptera)
In both males and females all bivalents co-orientated at metaphase I, the telomeres of homologous chromosomes being orientated towards opposite spindle poles Hence, they underwent prereduction in meiosis; no evidence for an inverted meiosis could be found.