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Position and orientation in the metaphase equator of an interchange quadrivalent of Allium triquetrum

Published online by Cambridge University Press:  14 April 2009

Geoffrey K. Rickards
Geoffrey K. Rickards
Affiliation:
Botany Department, Victoria University of Wellington, Private Bag, Wellington, New Zealand
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The position and orientation of an interchange quadrivalent in flattened, lateral views of metaphase I were studied in pollen-mother-cells of an interchange heterozygote of Allium triquetrum. The quadrivalent is most often located in marginal rather than central positions in the equator. Moreover, when positioned marginally the quadrivalent is more often than expected found in adjacent orientation, whilst when positioned centrally it is more often than expected found in alternate orientation. Consequently, the frequency of alternate (genetically balanced) orientation in the quadrivalent varies sharply according to whether data are obtained from more marginal or more central positions in the metaphase plate.

Type
Research Article
Information
Genetics Research , Volume 43 , Issue 2 , April 1984 , pp. 139 - 148
Copyright
Copyright © Cambridge University Press 1984

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