PETER MENZEL / SCIENCE PHOTO LIBRARY PETER MENZEL / SCIENCE PHOTO LIBRARY
Mummy's DNA testing. Researcher taking a sample from a 2000 year old mummy's foot for DNA analysis. DNA (deoxyribonucleic acid) is the molecule responsible for carrying the genetic code, which is slightly different in every individual. Familial traits can be traced by studying the differences. Taking DNA from preserved humans gives a good account of how humans spread across the world.
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