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Comportement des chromosomes surnuméraires et relation avec le taux de mortalité dans une population africaine de Locusta migratoria migratorioides

Behaviour of supernumerary chromosomes and its relation to the level of mortality in an african population of Locusta migratoria migratorioides

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Abstract

Transmission of supernumerary chromosomes is studied in adults and embryos of an African population of Locusta migratoria migratorioides; 34% of the animals show one or two B chromosomes (24% one, 10% two). This percentage is the same in both sexes. During mitosis, B chromosomes are very stable. At meiosis, in some cases they show pairing, in other cases they enter as univalents. The eventuality of synapsis or association is discussed. These two kinds of behaviour could not be explained by the presence of two different B chromosomes as is shown from the study of parthenogenetic progeny. Repartition of B chromosomes in the progeny is different depending on whether the male or the female parent supplies them; so the behaviour of these supernumerary should be conditioned, not by their own structure, but by a connection with the cell. — One B chromosome apparently is neutral. When there are two B chromosomes, in case of synapsis, the number of animals with two B in the progeny is slightly lower than previous; in case of asynapsis, there is a higher lethality of individuals and oocytes with two B chromosomes.

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  1. Laboratoire de Zoologie, Université Paris-Sud, Centre d'Orsay, France

    Robert Lespinasse

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Lespinasse, R. Comportement des chromosomes surnuméraires et relation avec le taux de mortalité dans une population africaine de Locusta migratoria migratorioides . Chromosoma 44, 107–122 (1973). https://doi.org/10.1007/BF00372577

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  • DOI: https://doi.org/10.1007/BF00372577

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