Theoretical and Applied Genetics

, Volume 74, Issue 3, pp 409–413 | Cite as

Analysis of lethals in selected lines of Drosophila melanogaster

  • A. Domínguez
  • J. Albornoz
  • E. Santiago
Article

Summary

Five lines of Drosophila melanogaster that reached an extreme phenotype after long-term selection for increased dorsocentral bristle number, were analysed for the presence of lethals. Seven chromosome II and three chromosome III lethal types were detected in four of the lines, at frequencies ranging from between 6% and 36%. No lethal had any demonstrable effect over the selected trait. In one line, where almost every chromosome II was a lethal carrier, it was shown that the main lethal (at a frequency of 36%) was associated with the transmission ratio distortion in males. The processes which could lead to the accumulation of this lethal and others linked in disequilibrium to it is discussed. Some results suggest similar mechanisms for the accumulation of lethals in the other lines. These findings show that causes other than the direct effect of artificial selection must be taken into account when trying to explain the accumulation of lethals in selected lines.

Key words

Artificial selection Lethals Segregation distortion Dorsocentral bristle number Drosophila melanogaster 

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Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • A. Domínguez
    • 1
  • J. Albornoz
    • 1
  • E. Santiago
    • 1
  1. 1.Departamento de GenéticaUniversidad de OviedoOviedoSpain

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