Abstract
A detailed analysis, using a modified silver staining technique which permits the visualization of the chromatid cores in bivalents at metaphase I, shows that some so-called chromosome associations are indeed true chiasmata. This study employs a supernumerary segment on the longest of the autosome pairs in the grasshopper Chorthippus jucundus that produces clear asymmetric bivalents in heterozygotes. Clear evidence of crossing over within the supernumerary segment explains part of the polymorphism of this segment, since unequal crossing over can produce different-sized segments. The origin of this segment and its mode of inheritance are also considered in the light of these results.
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Rufas, J.S., Gimenez-Abian, J., Garcia de la Vega, C. et al. Recombination within extra segments: evidence from the grasshopper Chorthippus jucundus . Chromosoma 96, 95–101 (1988). https://doi.org/10.1007/BF00331040
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DOI: https://doi.org/10.1007/BF00331040