But maybe intersex varies depending what genetic group you belong to or where you are born? AB blood certainly does - in the afforementioned Ireland and Scotland it’s roughly the same as global AB incidence, 3% of population, but it is most common in Korea. I believe no ethnic koreans are red headed so this ahould bring the numbers down significantly.
this was too interesting a question not to look at more seriously
If I understand correctly it’s like:
8,279,825,750×0.03×0.015×0.017 = 63,340.6669875
world pop x AB incidence x redhead incidence globally x intersex traits (any) incidence
And using only “noticeable”/ significant intersex traits, only 0.018-0.05 percent of the world seem to display these. So
8,279,825,750×0.03×0.015×0.00018 = 670.66588575 ≈ 671.
But maybe intersex varies depending what genetic group you belong to or where you are born? AB blood certainly does - in the afforementioned Ireland and Scotland it’s roughly the same as global AB incidence, 3% of population, but it is most common in Korea. I believe no ethnic koreans are red headed so this ahould bring the numbers down significantly.