Picture story. Sex and the single male X chromosome.
D000818:Animals; D029721:Drosophila Proteins; D004331:Drosophila melanogaster; D008297:Male; D009687:Nuclear Proteins / Q000502:physiology*; D019849:Sex Determination Processes; D014157:Transcription Factors / Q000502:physiology*; D014960:X Chromosome / Q000235:genetics*
D029721:Drosophila Proteins; D009687:Nuclear Proteins; D014157:Transcription Factors; C082132:msl-1 protein, Drosophila