Thirty-three DNA clones containing protein-coding genes have been used for in situ hybridization to the polytene chromosomes of two Drosophila repleta group species, D. repleta and D. buzzatii. Twenty-six clones gave positive results allowing the precise localization of 26 genes and the tentative identification of another nine. The results were fully consistent with the currently accepted chrom...

Grasshoppers have been much less studied than Drosophila when it comes to inversion polymorphisms, despite the occurrence of this rearrangement in several species of grasshoppers. In the present study, 354 males from a natural population of the New World species Trimerotropis pallidipennis, polymorphic for 6 pericentric inversions in 4 chromosome pairs, were sampled at the beginning and at the ...

In polytene chromosomes of Drosophila melanogaster, regions of pericentric heterochromatin coalesce to form a compact chromocenter and are highly underreplicated. Focusing on study of X chromosome heterochromatin, we demonstrate that loss of either SU(VAR)3-9 histone methyltransferase activity or HP1 protein differentially affects the compaction of different pericentric regions. Using a set of ...

Mechanisms of accumulation based on typical centromeric drive or of chromosomes carrying pericentric inversions are adjusted to the general karyotype differentiation in the principal Actinopterygii orders. Here, we show that meiotic drive in fish is also supported by preferential establishment of sex chromosome systems and B chromosomes in orders with predominantly bi-brachial chromosomes. The ...

Recurrent miscarriage becomes a problem that affect an increasing number of couples, almost 1% of the people who want to conceive. The aim of this study is to present the role of heterochromatic regions heteromorphism and chromosomal inversions in occurrence of recurrent miscarriage. In this study were included 354 couples with recurrent miscarriage, which presented at Medical Genetic Departmen...

Recent phylogenetic and molecular data are changing our knowledge about the relations between species evolutionary processes resulting in chromosome variation observed ants (Hymenoptera: Formicidae). Ants exhibit remarkable variations morphology, behavior, karyotypes, structure. By assembling genetic information trap-jaw from subfamily Ponerinae, we reconstructed relationships that inferred mon...

In an attempt to track the chromosomal differentiation in the Dichroplus elongatus species group, we analyzed the karyotypes of four species with classical cytogenetic and mapping several multigene families through fluorescent in situ hybridization (FISH). We improved the taxon sampling of the D. elongatus species group adding new molecular data to infer the phylogeny of the genus and reconstru...

Yates, T . L., R. J . Baker, and R. K . Barnett (Depar tment o f Biological Sciences and T h e Museum, Texas Tech University, Lubbock, Texas 79409) 1979. Phylogenetic analysis o f karyological variation i n three genera of peromyscine rodents. Sys t . Zool. 28:4048.-Chromosoma1 homologies between Neotomodon alstoni, Baiomys taylori and species of Peromyscus for which G-band chromosomal data are...

Drosophila ananassae Doleschall is a cosmopolitan and domestic species. It occupies a unique status among the Drosophila species due to certain peculiarities in its genetic behaviour and is of common occurrence in India. The most unusual feature of this species is spontaneous male meiotic recombination in appreciable frequency. The other unusual features are varied chromosomal polymorphism, hig...