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Analysis of heritability suggests how much of his extra height is a genetic cause and how much is due to environmental factors. Our individual is 5 cm taller than the population average. The white male population has an average height of 178 cm (5 ft 10 in) with a heritability of 80 percent. Let's analyze it on the following example: a man who is 183 cm (6 ft) tall. Heritability allows us to consider how the person's height is determined. A similar value was found in studies done by D. Miao-Xin Li of Human Normal University in China estimated that in the Chinese population, the heritability equals 65 percent. In Asian and African populations, the height heritability is notably lower. This is mainly due to different living environments (including nutrition, lifestyle and climate conditions) and different genetics combinations across communities. These values may vary a lot between ethnic populations as well. As we can see, the heritability varies even for men and women. A Finnish study on almost 9000 twins arrived at results of 78 percent for men and 75 percent for women. Height - the genetics behind a human appearanceīasing on various scientific studies, heritability contributes to around 80 percent of a child's height.
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These numbers come from estimations of the heritability of human height and from research examining what proportions of the height variation are determined by genetics. The role of environmental factors (especially nutrition) is estimated to be around 20-40%. The answer is that about 60-80% of the individual's height is determined by genetics. It is so significant that scientists suggest the proper question to consider should be "How much variation (the difference between individuals) in height is attributable to genetic effects and how much to nutritional effects?".