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Achiasmate meiosis and centromere shift in Eusimulium aureum (Diptera-Simuliidae)

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Abstract

Light and electronmicroscope studies indicate that Eusimulium aureum (n=2 metacentrics) is male-achiasmate. Supporting evidence for achiasmate meiosis includes lack of recombination between, I) widely separated differential segments of X and Y chromosomes and 2) linked autosomal inversions. In sibling C, chromosome II exists in an alternate “neoacrocentric” form interpreted as originating through the three-break shift of a small segment including centromere and nucleolar organizer. Male-achiasmate meiosis appears to be a prerequisite for the establishment of rearrangements that include large displacements of the centromere. This suggestion is supported by a correlation between achiasmate male meiosis and the fixation of gross pericentric changes in a number of other black fly species.

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Authors and Affiliations

  1. Department of Botany, University of Toronto, M5S 1A1, Toronto, Ontario, Canada

    K. H. Rothfels & G. F. Mason

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  1. K. H. Rothfels
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  2. G. F. Mason
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Rothfels, K.H., Mason, G.F. Achiasmate meiosis and centromere shift in Eusimulium aureum (Diptera-Simuliidae). Chromosoma 51, 111–124 (1975). https://doi.org/10.1007/BF00319829

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  • DOI: https://doi.org/10.1007/BF00319829

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