Achiasmatische Oogenese bei Trichopteren (original) (raw)

Abstract

No chiasmata are formed in the oogenesis of the caddis flies Limnophilus decipiens and L. borealis. In the Trichoptera, in likeness to what has been found in earlier cytologically analysed cases, the achiasmatic meiosis is confined to the heterogametic sex. The orders Trichoptera and Lepidoptera share the following cytological features: a) The female is heterogametic. b) No chiasmata are formed in oogenesis. c) Chromatin elimination takes place in the first meiotic division in the egg. d) In the Lepidoptera the chromosomes are holokinetic. This seems to be the case in the Trichoptera, too. e) Apyrene sperms are common. f) The most frequent chromosome number is practically the same: 31 in the Lepidoptera and 30 in the Trichoptera. These cytological similarities obviously originate from a period preceding the divergence of Trichoptera and Lepidoptera; this branching took place at the latest before the tertiary period. The preservation of these cytological similarities for at least 60 to 70 million years is an indication of the great stability of such cytogenetic system.

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  1. Genetisches Institut der Universität Helsinki, Finland
    Esko Suomalainen

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Herrn Professor Dr. J. Seiler zum 80. Geburtstag gewidmet.

Diese Untersuchung wurde ausgeführt mit Unterstützung der Finnischen Staatlichen Kommission für die Naturwissenschaften.

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Suomalainen, E. Achiasmatische Oogenese bei Trichopteren.Chromosoma 18, 201–207 (1966). https://doi.org/10.1007/BF00326868

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