Summary
In Gonista bicolor
(2n♀ = 22 + XX + 0 ∼ 2B1 + 0 ∼ 7B2, 2n♂ = 22 + XO + 0 ∼ 3B1 + 0 ∼ 16B2) frequencies of males with B1's in four natural populations were 29, 35, 14 and 72 per cent, respectively, and those with B2's were 97, 95, 76 and 92 per cent, respectively.
B1's were mitotically highly stable in the germ line of the males as well as in the somatic lines of both sexes. The mean numbers of B1's per male were 0·34, 0·50, 0·14 and 1·00, respectively, in the four populations.
B2's were mitotically unstable in somatic lines of both sexes. In the germ line of the males the instability of B2's was a characteristic confined to an early stage of development. Therefore, numbers of B2's in primary spermatocytes were variable from follicle to follicle within the individuals, though they were usually constant within the follicles. Mean numbers of B2's per follicle were also different among the four populations, i.e. 2·96, 1·77, 1·37, and 2·97, respectively.
Different tissues showed different mean numbers of B2's per cell; higher numbers in the ovariole walls than in the gastirc caeca (females), and higher numbers in the germ line than in the gastric caeca (males). An estimation of original zygotic numbers of the males indicated that different mean numbers of B2's between somatic and germ lines and between different somatic lines were accounted for on the basis of tendency to elimination of B2's in the somatic lines.
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Contribution from the Institute of Biology, Oita University, No. 85.
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Sannomiya, M. Cytogenetic studies on natural populations of grasshoppers with special reference to B chromosomes. Heredity 32, 251–265 (1974). https://doi.org/10.1038/hdy.1974.29
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DOI: https://doi.org/10.1038/hdy.1974.29
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