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Random dude's avatar

I don't think South Asians have less sexual dimorphism; it's an adaptation to climate, at least based on the studies I've read. North Indians tend to have taller faces with a shorter midface, while South Indians, particularly Tamils, have shorter, broader faces. Their features are Caucasoid or West Eurasian, but the Andamanese (Onge) ancestry makes their faces appear more rounded.

However, this has nothing to do with sexual dimorphism. If climate selects for a trait, it doesn't determine how masculine or feminine a face looks.

One could argue that climate never selected South Asians to be more sexually dimorphic, but this contradicts the data. Steppe herders are highly dimorphic, with dimorphism rates around 12 to 15 percent. Neolithic Iranians were also very dimorphic. I would argue that the AASI (Ancestral South Indian) population is even more dimorphic because their skulls are more robust and climate-adapted.

I believe the reasoning in this thread is flawed; it confuses climate adaptations with facial differences.

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James Russell's avatar

Ken, hi! I am an investigative journalist working on a story you may have some knowledge about. How can we connect?

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