How much South Slavic admixture to Turks from Turkey have?

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The answer of Gemini:

The genetic makeup of modern Turks from Turkey is a complex mosaic, reflecting centuries of migration and the "Elite Dominance" model of the Ottoman Empire. While often discussed in terms of Central Asian vs. Anatolian heritage, South Slavic (Balkan) admixture is a significant component, particularly in Western and Marmara regions.

On average, Turks from Turkey carry between 5% and 25% Balkan/South Slavic-related ancestry, though this varies drastically based on geography and family history.

The Sources of Slavic Admixture:

This genetic signature didn't arrive all at once; it was deposited through three primary historical mechanisms:

The Janissary System (Devshirme): For centuries, young boys from Balkan Slavic populations (Bulgarians, Serbs, Bosnians) were recruited into the Ottoman military and administration, eventually integrating into the Turkish elite.

The Muhacir Migrations: Following the collapse of Ottoman territories in Europe (late 19th and early 20th centuries), millions of Muslims—many of whom were ethnically Slavic or mixed—fled to Anatolia.

The Population Exchange (1923): While primarily involving Greeks, many "Muslim Greeks" from Macedonia and Thrace who moved to Turkey carried significant Paleo-Balkan and Slavic genetic markers.

Regional Breakdown:

Because Anatolia is a massive "bridge," the distribution of this South Slavic DNA is not uniform:

| Region | Est. Balkan/Slavic Admixture | Primary Driver |

East Thrace & Marmara: 20–35% - Direct proximity and heavy Muhacir settlement.
Western Anatolia (Izmir/Bursa): 15–25% - Resettlement of Balkan refugees post-1912.
Central Anatolia: 5–10% - Internal migration and Ottoman-era integration.
Eastern Anatolia: <5% - Higher Caucasian, Iranian, and Mesopotamian influence.

Genetic Context: The "Balkan" Signature
In professional genetic modeling (like G25 or qpAdm), this admixture is usually identified by its proximity to modern Bulgarians and Macedonians. It is characterized by a mix of:
1. Early European Farmer (EEF) ancestry.
2. Eastern Hunter-Gatherer (EHG) ancestry (associated with the Slavic migrations into the Balkans in the 6th–7th centuries).

Important Nuance: It is often difficult for DNA tests to distinguish between "Slavic" and "Paleo-Balkan" (Thracian/Illyrian) ancestry because these groups had already heavily intermixed by the time they integrated into the Turkish population.