5
Many of the genes that control height are on the y chromosome: http://press.endocrine.org/doi/full/...jcem.86.9.7875
The tallest countries in the world are in Scandinavia and the Balkans. This matches the distribution of haplogroup I pretty well: http://cache.eupedia.com/images/cont..._I-borders.gif. http://www.averageheight.co/average-...ght-by-country
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