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- W2047673586 abstract "Gelus californicus is a unique example, among Curculionoidea, of evolutionary mutation to a post-reductional sex-determining mechanism, autosomal behavior having remained perfectly conventional. It has the lowest reported chromosome number in the superfamily, 2n = 12 + XO, and is the only member known with certainty to lack a y. Ovarial preparations were unsuccessful, but of 11 males examined, 9 carried a minute chromosome, presumably a B, a 10th having two, and the 11th, two or four B's in different nuclei. B's are also post-reductional. The X and B only occasionally associate physically at metaphase I, but are more narrowly distributed than expected of non-homologous markers. This spatial association persists until early anaphase II, which finds both elements lagging on the equator. Persistent ectopic association apparently distorts segregation ratios, as the X and B were at the same pole in 17 of 21 late A II plates examined. The A II behavior of these elements effectively rules out an X + y or XO xo ♀ system. The origin of the mechanism and its relationship to other coleopteran examples are discussed." @default.
- W2047673586 created "2016-06-24" @default.
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- W2047673586 date "1972-12-01" @default.
- W2047673586 modified "2023-10-16" @default.
- W2047673586 title "LOW CHROMOSOME NUMBER AND POST-REDUCTIONAL XO IN <i>GELUS CALIFORNICUS</i> (LEC.) (COLEOPTERA: CURCULIONIDAE)" @default.
- W2047673586 cites W2003297967 @default.
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- W2047673586 doi "https://doi.org/10.1139/g72-104" @default.
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