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THE INTERSPECIFIC ORIGIN OF B CHROMOSOMES: EXPERIMENTAL EVIDENCE
Author(s) -
Perfectti Francisco,
Werren John H.
Publication year - 2001
Publication title -
evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.84
H-Index - 199
eISSN - 1558-5646
pISSN - 0014-3820
DOI - 10.1111/j.0014-3820.2001.tb00624.x
Subject(s) - biology , genetics , b chromosome , chromosome , introgression , meiosis , nasonia vitripennis , karyotype , evolutionary biology , gene , host (biology) , pteromalidae , parasitoid
.— 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 or 123 + 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.