When you were at school there is a good chance you learned that when it comes to human biological sex, two X sex chromosomes produces a female and one X sex chromosome and one Y sex chromosome produces a male. The thing is, that explanation, like so much taught at school, is a simplification based on the level of understanding a child can be expected to grasp. It’s nowhere near the full story, and no real biologist at all thinks that it is.

So what is the biological reality?

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Sources
https://blogs.scientificamerican.com/voices/stop-using-phony-science-to-justify-transphobia/

https://journals.physiology.org/doi/full/10.1152/physrev.00009.2006

https://www.amnesty.org/en/latest/news/2018/10/its-intersex-awareness-day-here-are-5-myths-we-need-to-shatter/

https://pubmed.ncbi.nlm.nih.gov/12476264/

https://www.livescience.com/39095-redhead-health-risks.html

Credits
Written by Andrew Johnson

Spoken by Andrew Johnson
Edited by Jackson Winter

School by David, Teacher by b farias, Transgender by Tamara, Finger, Refuse and Fight by Adrien Coquet, Biologist, Chemist and Avatar by monkik, Child by sandra and Confuse by evi1000 from the Noun Project
All other graphics created by Jackson Winter

Music
Stinger by Silent Partner
1940’s Slow Dance (Sting) by Doug Maxwell, Media Right Productions
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From something as small and complex as a chromosome to something as seemingly simple as the weather, sex determination systems vary significantly across the animal kingdom. Biologist and teacher Aaron Reedy shows us the amazing differences between species when it comes to determination of gender.

Lesson by Aaron Reedy, animation by BuzzCo (http://buzzzco.com).
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