Species of Chilocorus differ in chromosome number owing to centric fusion of metacentric chromosomes. The concomitant loss of arms is tolerated because in all unfused chromosomes one arm is completely heterochromatic, the other euchromatic. Under the influence of colchicine, the arms of unfused and fused chromosomes contract differentially. Unless the distribution of heterochromatin is known, karyotype analysis is destined to failure.
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Similar content being viewed by others Explore related subjectsDiscover the latest articles and news from researchers in related subjects, suggested using machine learning. LiteraturePatau, K.: The identification of individual chromosomes, especially in man. Amer. J. hum. Genet. 12, 250–276 (1960).
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Forest Insect Laboratory, Sault Ste. Marie, Canada
Stanley G. Smith
Dedicated to Professor H. Bauer on the occasion of his sixtieth birthday.
Contribution No. 1138, Forest Entomology and Pathology Branch, Department of Forestry, Ottawa, Canada.
About this article Cite this articleSmith, S.G. Heterochromatin, colchicine, and karyotype. Chromosoma 16, 162–165 (1965). https://doi.org/10.1007/BF00320946
Received: 27 September 1964
Issue Date: March 1965
DOI: https://doi.org/10.1007/BF00320946
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