Die intraspezifische Variabilität des heterochromatischen Armes eines Chromosoms bei der GattungCarabus L. (Coleoptera) |
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Authors: | Dr Friedrich Weber |
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Institution: | 1. Zoologisches Institut der Universit?t, Badestra?e 9, 44, Münster
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Abstract: | The chromosome complement ofC. auronitens
Fabr. is 2n
♂=26+XY. One autosomal pair—called A-chromosomes—is relatively long.A-chromosomes consist of a euchromatic and a heterochromatic arm. Labelling of mitotic chromosomes with3H-thymidine shows that replication of the heterochromatic arm continues when it has ended in the euchromatic arm. In males
and females the length of the heterochromatic arm varies intraindividually. In 47 of 99 males the heterochromatic arms were
heteromorphic. Calculations of the quotient length of the euchromatic/length of the heterochromatic arm have shown that at
least 6 different types of the A-chromosome exist. These types differ from each other in the number of heterochromatic sections
separated by constrictions. The longest heterochromatic arm observed consisted of 8 such sections. The genetic significance
of the heterochromatin in the genus ofCarabus is at present unknown (Zusammenfassung see p.305).
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