Genetische Analyse zweier Mutanten von Dinophilus gyrociliatus (Archiannelida) mit veränderter Eigröße

Abstract

D. gyrociliatus has two types of eggs: a smaller type giving rise to ♂♂, and a larger type developing into ♀♀. Two mutants, which originated in laboratory cultures derived from animals collected at Helgoland, produced eggs of an abnormal size; the first, "Gr", yielding larger-than-normal male-type eggs, the second, "Kl", smaller male-type eggs. Size of eggs is determined by the genotype of the mother, the genotype of the eggs being without influence. Both mutants show a dominant monofactorial inheritance. In crosses with Gr/Gr-individuals an exceptionally high rate of reverse mutations to wildtype (1,4 to 5,0 %) has been observed. Results indicate that Gr is either an unstable gene or a chromosome mutation in the form of a duplication or trisomy of one chromosome. © 1968 Biologischen Anstalt Helgoland.