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How Genetically Similar Are You To A Stranger?

How related are you to a random stranger, and how would we go about figuring that out?

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Meiosis and Formation of Eggs and Sperm

App to prevent ‘accidental incest’ proves a hit with Icelanders

“The risk of Icelanders accidentally sleeping with a relative is apparently high enough to justify the creation of a smartphone app to help prevent it.”

1 in 200 men direct descendants of Genghis Khan

“In 2003 a groundbreaking historical genetics paper reported results which indicated that a substantial proportion of men in the world are direct line descendants of Genghis Khan.”

Genetic Similarities Within and Between Human Populations

“The proportion of human genetic variation due to differences between populations is modest, and individuals from different populations can be genetically more similar than individuals from the same population.”


“Help! I cannot seem to grasp why siblings are said to be 50% alike genetically when humans are said to be, say, 85% the same genetically as mice.”


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