Summary
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1.
In a sample of 27 males and 15 females from an inbred culture of Pyrgomorpha kraussi four classes of individuals could be distinguished. Those: a) With a standard chromosome complement, 2n = 18 + XX/XY, b) Where the standard complement was supplemented by a single B chromosome, c) Presumably polysomic for structurally altered or unaltered members of the A complement, and d) As in c) but with a B chromosome.
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2.
Abnormal chromosome behaviour indicative of genotypic unbalance was found in twelve males.
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3.
Abnormality consists in the occurrence of: a) Polyploid cells, b) Aneuploid cells, c) Chromosome breakage, and d) Unstained regions. The last three anomalies affect only the A chromosomes.
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4.
There is considerably variation both within and between individuals in respect of these anomalies. But the number of stable males in the B chromosome class is significantly higher than in other classes and all the males with S + B are stable.
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5.
It is argued that metabolic DNA, and consequently heterochromatic B chromosomes, are important in relation to the mechanical aspects of chromosome behaviour.
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6.
The B chromosomes are of unknown origin but the extra A chromosomes in aneuploid cells rarely form multivalents and thus one of the conditions of independent evolution is partially fulfilled.
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Lewis, K.R., John, B. Breakdown and restoration of chromosome stability following inbreeding in a locust. Chromosoma 10, 589–618 (1959). https://doi.org/10.1007/BF00396589
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DOI: https://doi.org/10.1007/BF00396589