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Male germ line, spermatogenesis and karyotypes of Heteropeza pygmaea winnertz (Diptera: Cecidomyiidae)

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Abstract

The germ line during the development of the male of the gall midge Heteropeza pygmaea was followed cell generation by cell generation. The development of the male egg begins with two meiotic divisions, followed by fusion of one of the resulting nuclei with (usually) two somatic nuclei (regulation), after which the regulated nucleus passes through 9–10 mitoses, and finally a further two meiotic divisions producing the spermatids. The chromosome numbers (determined by colchicine and air-drying techniques) of the race studied are 55 in the female germ line, very variable with a mean near 47–48 in the male germ line after regulation, 5 or 6 in the sperms, 10 in the female somatic nuclei and 5 in the male somatic nuclei. Statistical techniques for analysis of the different karyotypes are developed and a model explaining the known cytological events in Heteropeza is presented.

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  1. Department of Zoology, University of Helsinki, Finland

    Samuel Panelius

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  1. Samuel Panelius
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Panelius, S. Male germ line, spermatogenesis and karyotypes of Heteropeza pygmaea winnertz (Diptera: Cecidomyiidae). Chromosoma 32, 295–331 (1971). https://doi.org/10.1007/BF00284840

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  • DOI: https://doi.org/10.1007/BF00284840

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