Sex allocation in animals.
D000222:Adaptation, Physiological; D000818:Animals; D012734:Disorders of Sex Development / Q000235:genetics; D005260:Female; D008297:Male; D008433:Mathematics; D008957:Models, Genetic; D012641:Selection, Genetic; D012723:Sex; D012730:Sex Chromosomes; D012732:Sex Determination Analysis; D012744:Sex Ratio