NOR regions of polychaete worms of the genus Ophryotrocha studied by chromosome banding techniques and FISH

Article Abstract:

The results of cytogenetic analyses undertaken on 10 species of polychaete worms of the genus Ophryotrocha (Dorvilleidae) are reported. Chromosome banding techniques and ribosomal fluorescent in situ hybridization techniques were used. It is likely that only minor cytological changes have occurred in the karyotype evolution of the species.

Polychaeta, Polychaetes

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Karyotype analysis, banding, and fluorescent in situ hybridization in the Scarab beetle Glymopleurus sturmi McLeay (Coleoptera Scarabaeoidea: Scarabaeidea)

Article Abstract:

The karyotype of Glymopleurus sturmi (Scarabaeoidea: Scarabaeidea) was investigated using conventional staining, differential banding and in situ hybridization. Results suggest that the telomeric hesanucleotide (TTAGGG)n is not as conserved within eukaryotes as previously hypothesized.

Genetic aspects, Beetles

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XY chromosome sex systems in the neogastropods Fasciolaria lignaria and Pisania striata

Article Abstract:

A study was conducted to examine the mitotic and meiotic chromosomes of the neogastropods Fasciolaria lignaria and Pisania striata. The specimens were treated with 0.01% colchicine in seawater between 18 degrees C to 20 degrees C. The air-drying and squash methods were utilized to prepare chromosomes before the air-dried slides were stained with a Giemsa solution. Results indicated that a differentiated y chromosome of F lignaria does not support heterogeneous DNA.

DNA, X chromosome, Y chromosome

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