A CYTOLOGICAL SURVEY OF WILD POPULATIONS OF TRIMEROTROPIS AND CIRCOTETTIX (ORTHOPTERA, ACRIDIDAE). II. RACIAL DIFFERENTIATION IN T. SPARSA

TL;DRAbstract

N the first paper of this series Certain of the species in section B are extremely interesting, since one or more autosomes may be either acrocentric or metacentric. In these cases it is clear that structural rearrangements have occurred, converting the originally acrocentric chromosomes into metacentrics, but both the " old " and the " new " types of chromosomes have persisted, alongside one another, in the natural ppulations of the species. Such species are accordingly cytologically polymorphic, a large proportion of the individuals collected in nature being structural heterozygotes, in which one or more pairs of chromosomes are represented by an acrocentric and metacentric element. The existence of this type of polymorphism in certain species of Trimerotropis and Circotettix has 1 m n known since the work of In certain forms the problem is further complicated by the fact that supernumerary chromosomes are present in some individuals but not in others.

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