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Sexual behavior: how Sex Peptide flips the postmating switch of female flies

Eric Kubli1, Daniel Bopp

  • 1Institute of Molecular Life Sciences, University of Zurich-Irchel, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland. ekubli@zool.uzh.ch

Current Biology : CB
|July 14, 2012
PubMed

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The Ratio of X Chromosome to Autosomes02:45

The Ratio of X Chromosome to Autosomes

In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.  
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...