No sub-Saharan genes - since time zero, the theoretical last common ancestor, sub-Saharan populations have mixed with hominid populations. These genes are not possessed by the people who left Africa these hypothetical 70k years ago. The topic is complex because, for example, modern Egyptians have this admixture, it appeared after the fall of Rome, has to do with the slave trade. At the same time, the ancient Egyptian population did not have these genes. The ancestors of the Poles conquered India, and then created a caste system to prevent the mixing of genes with local Dravidians (a large percentage of Denisovan genes). Some migrated further north, including to modern Poland. The article traces the migration history of haplogroup R1a1 from 20,000 to 3,500 years ago, pointing to an origin in Central Asia and a journey to Europe, developing the Proto-Indo-European language. DNA research confirms these migrations, and the author also examines links to the R1b1a2 haplogroup and issues related to Indo-Europeans.