Summary
The proximal half of the A (=X) chromosome ofD. madeirensis has a gene arrangement very similar to the A1 or A6 inversions found inD. subobscura. Polytene chromosome analysis of hybrids betweenD. madeirensis and strains ofD. subobscura homozygous for such inversions shows, however thatD. madeirensis has a gene arrangement different from any known forD. subobscura. These results provide evidence for a greater differentiation of the X chromosome in these species than has previously been described; it seems that the X chromosome is the only one that has undergone structural variation during the speciation process.
References
Monclús, M., Z. zool. Syst. Evolut. Forsch.22 (1984) 94.
Krimbas, C. B., and Loukas, M., Heredity53 (1984) 469.
Kunze-Mühl, E., and Müller, E., Chromosoma9 (1958) 559.
Jungen, H., Arch. Julius Klaus-Stift. VeterbForsch.43 (1968) 3.
Moltó, M. D., De Frutos, R., and Martinez-Sebastián, M. J., Genetica75 (1987) 55.
Charlesworth, B., Coyne, J. A., and Barton, N. H., Am. Nat.130 (1987) 113.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Papaceit, M., Prevosti, A. Differences in chromosome A arrangement betweenDrosophila madeirensis andDrosophila subobscura. Experientia 45, 310–312 (1989). https://doi.org/10.1007/BF01951821
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF01951821