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1 May 2001 THE INTERSPECIFIC ORIGIN OF B CHROMOSOMES: EXPERIMENTAL EVIDENCE
Francisco Perfectti, John H. Werren
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Abstract

A centric fragment was generated during the introgression of a chromosome region from Nasonia giraulti into N. vitripennis. This neo B chromosome carries the N. giraulti or123 gene for wild-type eye color. Using this phenotypic effect, the transmission of this chromosome was analyzed. The supernumerary chromosome showed less than Mendelian segregation rate in meiosis and some mitotic instability manifested as mosaic phenotype for eye color. However, transmission rate and mitotic stability increased over successive generations. The transmission rate through male gametogenesis was nearly 100%. These results support the interspecific hybridization model for B chromosome origin and reveal that problems in chromosome stability can persist for several generations after “foreign chromosomes” are introduced into a different species. We suggest that hybrid zones should be investigated as possible sites for neo-B chromosome generation.

Corresponding Editor: J. Mallet

Francisco Perfectti and John H. Werren "THE INTERSPECIFIC ORIGIN OF B CHROMOSOMES: EXPERIMENTAL EVIDENCE," Evolution 55(5), 1069-1073, (1 May 2001). https://doi.org/10.1554/0014-3820(2001)055[1069:TIOOBC]2.0.CO;2
Received: 18 July 2000; Accepted: 1 December 2000; Published: 1 May 2001
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KEYWORDS
B chromosome evolution
interspecific hybrids
mitotic instability
Nasonia vitripennis
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