Summary
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(1)
In Mecostethus grossus chiasma-localisation affects the chromosomes to different degrees. One individual was found showing unusual variability in regard to chiasma frequency.
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(2)
Metrioptera brachyptera (Tettigoniidae) shows chiasma-localisation, at any rate in the five larger bivalents. As in Mecostethus the different bivalents are unequally affected.
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(3)
In both species the relation between chiasma-frequency and chromosome length is an indirect one, some of the smaller bivalents having a higher chiasma frequency than larger ones.
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(4)
The causes of chiasma-loealisation are briefly discussed.
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White, M.J.D. Chiasma-localisation in Mecostethus grossus L. and Metrioptera brachyptera L. (Orthoptera). Z. f. Zellforschung u. mikr. Anatomie 24, 128–135 (1936). https://doi.org/10.1007/BF00401218
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DOI: https://doi.org/10.1007/BF00401218