Summary
Nine populations of the grasshopper Phaulacridium marginale were investigated cytologically.
One population (OM) was found to be extensively polymorphic for both B chromosomes and supernumerary heterochromatic segments on the three smallest autosomes (S9–11).
Differences between populations were demonstrated for mean cell chiasma frequency but not for between-cell variance.
Owing to the small number of individuals sampled and the large number of karyotypic classes possible in OM no meaningful conclusions could be drawn for the effect of the extra heterochromatic on chiasma formation.
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Westerman, M., Fontana, P. Polymorphisms for extra heterochromatin in Phaulacridium marginale. Heredity 31, 223–229 (1973). https://doi.org/10.1038/hdy.1973.77
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DOI: https://doi.org/10.1038/hdy.1973.77
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