Sex determination. One for a boy, two for a girl? The Genetics Review Group.
Sex determination in flies relies on the different ratio of X chromosomes to autosomes in XX females and XY males. Mammals have a male-determining Y-linked gene, but may retain dosage-related elements.
D000818:Animals; D017173:Caenorhabditis elegans / Q000235:genetics; D004303:Dosage Compensation, Genetic; D004331:Drosophila melanogaster / Q000235:genetics; D005260:Female; D006801:Humans; D008297:Male; D008322:Mammals / Q000235:genetics; D012733:Sex Differentiation; D014960:X Chromosome / Q000502:physiology*; D014998:Y Chromosome / Q000502:physiology*