Abstract
Three plants of cultivated rye heterozygous for reciprocal translocations have been used to analyze the centromere co-orientation in ring quadrivalent associations at metaphase I. New cytological evidence of the existence of the alternate-II configuration is presented. From the statistical analysis of the data one can deduce that: (i) the four configurations (adjacent-I, adjacent-II, alternate-I and alternate-II) appear with different frequencies, (ii) alternate co-orientations are much more frequent than adjacent ones, (iii) co-orientations of type I are more frequent than those of type II, (iv) among the alternate configurations those of type I are much more frequent than those of type II, (v) among the type I co-orientations the alternate configuration is much more frequent than the adjacent one, (vi) there is no correlation between the percentages of type I and type II classes within the adjacent and alternate co-orientations.
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Lacadena, J.R., Candela, M. Centromere Co-orientation at metaphase I in interchange heterozygotes of rye, Secale cereale L.. Chromosoma 64, 175–189 (1977). https://doi.org/10.1007/BF00327057
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DOI: https://doi.org/10.1007/BF00327057