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    It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. Is there any biological rules that limits what should be the ratio between sexes or I could just pick whatever works best for my story? I've added hermaphrodites for storytelling purposes. I don't plant to explain how they've evolved.
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    Influence of the X-Chromosome on Neuroanatomy: Evidence from Turner and Klinefelter Syndromes

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    Try out PMC Labs and tell us what you think. Learn More. Fundamental differences exist between males and females, encompassing anatomy, physiology, behaviour, and genetics. Such differences undoubtedly play a part in the well documented, yet poorly understood, disparity in disease susceptibility between the sexes. Although traditionally attributed to gonadal sex hormone effects, recent work has begun to shed more light on the contribution of genetics — and in particular the sex chromosomes — to these sexual dimorphisms.
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    Sex Chromosome Effects on Male–Female Differences in Mammals

    Try out PMC Labs and tell us what you think. Learn More. Author contributions: D. Studies of sex effects on neurodevelopment have traditionally focused on animal models investigating hormonal influences on brain anatomy.
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