How can we explain the fact that 1%-4% of the genome of modern Europeans and Asians can be identified as Neandertal but that there are no Neandertal genes in the genome of modern Africans?

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The Answer of How can we explain the fact that 1%-4% of the genome of modern Europeans and Asians can be identified as Neandertal but that there are no Neandertal genes in the genome of modern Africans?

How Can We Explain the Fact That 1%-4% of the Genome