Genetics / Molecular Evolution / Molecular Mechanics / Biological Sciences / RNA interference / Drosophila / Phylogeny / Meiosis / Sex ratio / Female / Animals / Male / Sex chromosomes / Y chromosome / X chromosome / Amino Acid Sequence / Base Sequence / Sex Chromosome / Molecular Sequence Data / Drosophila / Phylogeny / Meiosis / Sex ratio / Female / Animals / Male / Sex chromosomes / Y chromosome / X chromosome / Amino Acid Sequence / Base Sequence / Sex Chromosome / Molecular Sequence Data