3. SRD5A2 What is the role of this gene in development of external genitalia? Does this gene act in a simple Mendelian matter to determine whether external genitalia are male or female? (Note: XY people with a deficiency in this gene have a phenotype similar to the one shown by Caster Semenya in the video. If she has been tested for this condition, the results have not been made public.)

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