quality:correction, quality:corruption, information:filtering
Genetics

Consistent with the proximity of their languages, analyses of Y chromosomes, mDNA, and autosomal marker CCR5de132 shows that East Slavs and West Slavs are genetically very similar, but demonstrating significant differences from neighboring Finno-Ugric, Turkic, and North Caucasian peoples. Such genetic homogeneity is somewhat unusual, given such a wide dispersal of Slavic populations. Together they form the basis of the " East European " gene cluster, which also includes non-Slavic Hungarians and Aromanians.

Only Northern Russians among East and West Slavs belong to a different, " Northern European " genetic cluster, along with Balts, Germanic and Baltic Finnic peoples (Northern Russian populations are very similar to Balts).

The 2006 Y-DNA study results "suggest that the Slavic expansion started from the territory of present-day Ukraine, thus supporting the hypothesis placing the earliest known homeland of Slavs in the basin of the middle Dnieper ". According to genetic studies until 2020, the distribution, variance and frequency of the Y-DNA haplogroups R1a and I2 and their subclades R-M558, R-M458 and I-CTS10228 among South Slavs correlate with the spread of Slavic languages during the medieval Slavic expansion from Eastern Europe, most probably from the territory of present-day Ukraine and Southeastern Poland.

According to a 2017 study, Slavic speakers like Russians, Ukrainians and Belarusians have similar genetic components. Ukrainians and Belarusians have near-equal amounts of two "European components", which are commonly found in North Europe and Caucasus respectively. There is also no evidence of Asian admixture. However, samples of Novosibirsk residents and Old Believers in Siberia have 5-10% Central Siberian ancestry despite being genetically close to European Slavs.