Structure of a yeast pheromone gene (MF alpha): a putative alpha-factor precursor contains four tandem copies of

Cell
|October 1, 1982
PubMed

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Combinatorial Gene Control02:33

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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.  
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