We will give a simple, unified, possible explanation of several debated genetic issues on todays humans, Neandertals and Denisovans. In particular it is shown by means of a simple mathematical model why there is little genetic variation in todayss human population or in Western Neandertal population, why all mtDNA and y-chromosomes in todays humans seem to have African origin with no trace of Neandertal nor Denosovan mtDNA or y-chromosomes, why a big part of the European gene pool is young (from Neolitic time), and why todays East Asians have mode Neandertal genes than todays Europeans.
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