The decentric nature of the metacentric B chromosome of Metaleptea brevicornis adspersa (Acridinae, Acrididae)

Article Abstract:

The meiotic behavior of a large B isochromosome of Metaleptea brevicornis adspersa (Acridinae, Acrididae) has been studied in both sexes and two models for the origin of isochromosomes postulated. In males both arms of the B chromosome synapse at zygotene-early pachytene and suggest its isochromosomal nature. The dicentric nature of the N was confirmed by silver staining of kinetochores at metaphase I and anaphase II stages. A dicentirc B isochromosome has not previously been described.

United States, Argentina

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The effects of Robertsonian fusions on chiasma frequency and distribution in the house mouse (Mus musculus domesticus) from a hybrid zone in northern Scotland

Article Abstract:

Robertsonian fusions and their effects on chiasma frequency and distribution in male house mice have been studied in a hybrid zone in northern Scotland. A differential effect of heterozygous and homozygous Rb fusions on chiasma frequency and localization in male mice from the hybrid zone is described.

United Kingdom, Scotland, Reports, Mice, Mice (Rodents), Genetic research, Hybridization

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No harmful effects of a selfish B chromosome on several morphological and physiological traits in Locusta migratoria (Orthoptera, Acrididae)

Article Abstract:

The analysis of possible effects of B chromosomes in Locusta migratoria, migratory locusts, in Spain, on several physiological and morphological traits and some other traits that pertain to female fitness is discussed. No harmful effects of a selfish B chromosome are seen on several morphological and physiological traits, and B chromosomes were not seen to be strongly parasitic in the studied population.

Spain, Morphology (Biology), Chromosomes, Morphology, Physiology

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