ALTAIAN (SIBERIAN)

Для  тех, кто  считает, что  гаплогруппа  R1a ,  была  европеоидной (согласно  генетикам  она  якобы  родилась  на  Алтае) не  плохо  бы  взглянуть  на  состав  генотипа  алтайцев  и  монголов.

ALTAIAN (SIBERIAN)

This reference population is based on samples collected from a native Siberian population living in the Altai region, a mountainous area located in south-central Siberia on the borders of present-day Mongolia, China, Kazakhstan, and Russia. In addition to the 53% Northeast Asian component typical of Siberian and Mongolian populations, there is also a western Eurasian contribution of 22% Southwest Asian, 17% Northern European, and 2% Mediterranean, which shows the connection to steppe nomads of western Eurasian origin, as well as migrations from the Middle East with the spread of agriculture over the past 10,000 years, and recent migration from Russian populations. The 4% Native American component reflects the fact that the ancestors of today’s Native Americans likely originated in this region.

MONGOLIAN

This reference population is based on samples collected from the native populations of Mongolia. In addition to the 67% Northeast Asian component typical of Siberian and Mongolian populations, there is also a western Eurasian contribution of 12% Southwest Asian, and 6% Northern European, which shows the connection to steppe nomads of western Eurasian origin, as well as migrations from the Middle East with the spread of agriculture over the past 10,000 years, along with some recent migration from Russian populations. The 9% Southeast Asian component is likely a result of admixture with groups further to the south, such as the Chinese. The 4% Native American component reflects the fact that the ancestors of today’s Native Americans probably originated in this region.

источник

Можно конечно сочинить сказку - что  на  момент  образования  этой  гаплогруппы  там  жили  европеоиды, но  затем  они  испарились...  улетучились....
Надо  сказать, что  на  Алтае - уже  как  400 лет  идёт  белая  русская  колонизация, так  что  изменение  генофонда  по  сравнению с  Монголией  понятно.