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Those who claim that biological sex is not binary, but rather a spectrum of possibilities, will often use intersex to argue their case. To many, such variation shows us that the male-female binary is unreliable, that there are more than two sexes, and that sex is a spectrum. But, is this true?

*This video was re-issued thanks to feedback from developmental biologists and intersex individuals.

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Scientific Literature:
[1] Sekido, R., Lovell-Badge, R. (2009). Sex determination and SRY, Down to a wink and a nudge. Trends in Genetics, 25(1).
[2] Kashimada, K., Koopman, P. (2010). Sry, the master switch in mammalian sex determination. Development, 137.
[3] Kimball, J. (2020). Sex chromosomes. LibreText.org.
[4] Gilbert, SF. (2000). Chromosomal sex determination in mammals. Developmental Biology, 6th edition. Sunderland (MA), Sinauer Associates.
[5] Wizemann, TM., Pardue ML, editors. (2001). Sex begins in the womb. Exploring the biological contributions to human health: Does sex matter? US Institute of Medicine.
[6] Carlson, B. (2014). Chapter 16, Urogenital System. Human Embryology and Developmental Biology. 404-407.
[7] Graham, C. (2019). Is sex a spectrum? Sex determination and differentiation. MRKHVoice.
[8] Loof, A. (2018). Only two sex forms but multiple gender variants. Communicative & Integrative Biology, 11(1).
[9] Cox, P., Togashi, T. (2011). The Evolution of Anisogamy, A Fundamental Phenomenon Underlying Sexual Selection. New York Cambridge University Press.

Contributors to this video:
[1] Claire (@intersexfacts)
[2] Rae (@RaeUK)

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