If about 2% of your genome is Neandertal (which is common among Europeans) than you share as much DNA with a Neandertal as you do with your:

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You share about 2% of your DNA with a Neandertal, which is roughly equivalent to the amount of DNA you would share with a great-great-great-great-grandmother. This comparison is based on the way DNA inheritance works, where you inherit about 50% of your DNA from each parent, and this percentage halves with each subsequent generation.

If About 2% of Your Genome Is Neandertal (Which Is