• A. C. E. Suley

      Articles written in Journal of Genetics

    • Genetics and cytology ofDrosophila subobscura - III. Transplantation of eye-buds betweenDrosophila subobscura andDrosophila melanogaster

      J. M. Rendel A. C. E. Suley

      More Details Abstract Fulltext PDF

      Cardinal inDrosophila subobscura, now called vermilion, is homologous with vermilion inD. melanogaster.

      Scarlet and cherry implants are autonomous in wild-type hosts and are not homologous with cinnabar.

      Poppy implants are autonomous in wild-type hosts, but poppy maroon implants are pinker in wild-type hosts. Poppy may behave like bright inD. melanogaster.

      Wild type is autonomous in maroon. Maroon is therefore not homologous with claret.

    • Genetics ofDrosophila subobscura - VIII. studies on the mutant grandchildless

      A. C. E. Suley

      More Details Abstract Fulltext PDF

      The genegranclchildless, gs, inDrosophila subobscura (Spurway, 1948) has a maternal or delayed zygotic effect, causing all, or nearly all, the offspring of a gs/gs ♀ to he sterile, with reduced gonads.

      Experiments are described in which gonad transplants were made between sterile and fertile larvae. All implants developed autonomously, and sterile females were found capable of producing normal foster-children from an implanted ovary.

      A stock was obtained, related to ‘normal’ gs lines, which showed sterility and gonad abnormality in a proportion of sibs only. The genetic determination not only of theoccurrence of sterile flies, in a brood, but also of thepercentage sterility in a brood, proved to be maternal. An attempt was made to analyse, to some extent, the relationship of this stock to a ‘normal’ gs stock. Some possible modes of action of maternally acting modifiers on the expression of the main gene are discussed. For example, the increased activity of maternally acting recessive modifiers may produce a decrease in homozygous expression of the main gs switch gene, correlated with the appearance and increase of heterozygous expression and/or even of a mimic phenotype in the offspring of gs+/gs+ females.

      Breeding experiments were used to show that the sterilizing power of a maternal. genotype is never effective beyond the first generation, even when the mother of the second generation is herself affected to the extent of having only one ovary.

      It is clear that the genetical factors involved, though variable, are all concerned with some process of egg production in the mother of sterile individuals, though the effects are never, or rarely, transmissible to transplants made when the mother is still a larva.

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