Extreme chromosomal polymorphism in a coccinellid beetle

descriptionPublicationkeyboard_double_arrow_right Article 01 Feb 1956 English Publisher:Springer Science and Business Media LLCJournal:Experientia, volume 12, pages 52-53 (issn: 0014-4754, eissn: 1420-9071,

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Authors: S. G. Smith;

doi: 10.1007/bf02164672

Extreme chromosomal polymorphism in a coccinellid beetle

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Abstract

Von drei ♂ ♂ vonChilocorus stigma wies ein Tier eine (A), eines zwei (A, B) und das dritte drei (A, B, C) zentrische Fusionen auf; 2n war 26, 25 und 24. Beim ♂ mit 2n = 24 sind mindestens zwei Bivalente heterozygot. Abgesehen vom Unterschied der Geschlechtschromosomen (XX♀: XO♂) sind daher 243 verschiedene chromosomale Typen moglich. 2n wird von 21 (♂) zu 28 (♀) variieren. Weitere Fusionen bei den Chromosomen der heterozygoten Paare wurden zu 2n = 19 fuhren, wahrend sich nach andern Fusions-Kombinationen Ringkomplexe bilden mussten.

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