Abstract
Paracentric inversion heterozygosity can be detected at pachytene by observation of frequent regions of asynapsis and reinforced by observation of the elimination of a chiasma in the region of the inversion at diplotene and by a low level of bridges and fragments at anaphase. We present evidence that paracentric inversion polymorphism can persist in a grasshopper population despite a low level of crossing over within the inverted region in heterozygotes. Lethality resulting from aneuploidy due to limited crossing over within the region of the inversion appears to be more than compensated for by heterosis.
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Haines, R.L., Roberts, P.A. & Lattin, J.D. Paracentric inversion polymorphism in the grasshopper Boonacris alticola . Chromosoma 65, 185–197 (1978). https://doi.org/10.1007/BF00329470
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DOI: https://doi.org/10.1007/BF00329470