Y-DNA studies on Bosniaks (in Bosnia and Herzegovina) show close affinity to other neighboring South Slavs. Y-DNA results show notable frequencies of I2 with 43.50% (especially its subclade I2-CTS10228+), R1a with 15.30% (mostly its two subclades R1a-CTS1211+ and R1a-M458+), E-V13 with 12.90% and J-M410 with 8.70%. Y-DNA studies done for the majority Bosniak populated city of Zenica and Tuzla Canton, shows however a drastic increase of the two major haplogroups I2 and R1a. Haplogroup I2 scores 52.20% in Zenica (Peričić et al., 2005) and 47% in Tuzla Canton (Dogan et al., 2016), while R1a increases up to 24.60% and 23% in respective region. Haplogroup I2a-CTS10228, which is the most common haplogroup among Bosniaks and other neighbouring South Slavic populations, was found in one archeogenetic sample (Sungir 6) (~900 YBP) near Vladimir, western Russia which belonged to the I-CTS10228&gt;S17250&gt;Y5596&gt;Z16971&gt;Y5595&gt;A16681 subclade. It was also found in skeletal remains with artifacts, indicating leaders, of Hungarian conquerors of the Carpathian Basin from the 9th century, part of Western Eurasian-Slavic component of the Hungarians. According to Fóthi "et al." (2020), the distribution of ancestral subclades like of I-CTS10228 among contemporary carriers indicates a rapid expansion from Southeastern Poland, is mainly related to the Slavs, and the "largest demographic explosion occurred in the Balkans". Principal component analysis of Y-chromosomal haplogroup frequencies among the three ethnic groups in Bosnia and Herzegovina, Serbs, Croats, and Bosniaks, showed that Bosnian Serbs and Bosniaks are by Y-DNA closer to each other than either of them is to Bosnian Croats.