lie on ancestral lineages of Neandertals, Denisovans and modern humans.”
Hominids throughout Eurasia during that time may have shared a mitochondrial DNA pattern observed in Sima de los Huesos Neandertals and Asian Denisovans,
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, Meyer suggests. If that was the case, Neandertals acquired a new form of mitochondrial DNA by interbreeding with modern humans or their direct ancestors from Africa sometime between 430,000 and 100,000 years ago (SN: 3/19/16,
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, p. 6),
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.
Another possibility is that Neandertals traveled to Europe from Asia more than 430,
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,000 years ago, carrying Denisovan mitochondrial DNA with them,
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, says paleogeneticist Carles Lalueza-Fox of the Institute of Evolutionary Biology in Barcelona. Or hybrid descendants of early Neandertals and early Denisovans may have lived at Sima de los Huesos, carrying Denisovan mitochondrial DNA,
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, he speculates.
“We really need more genetic data from Sima de los Huesos, and other sites of that age, to narrow down these scenarios,
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,” Meyer says.

Charles Darwin didn’t know about genes and DNA. In fact,
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, hardly anyone noticed when Gregor Mendel, a monk whose pea experiments eventually led to modern genetics, published his findings in an obscure journal a few years after Darwin’s On the Origin of Species appeared in 1859. It would take nearly a century more before James Watson and Francis Crick deciphered the structure of DNA, the molecule that contains the manual for building an organism. Yet Darwin was still able to describe a mechanism — natural selection — for how evolution shapes life on Earth. That’s like describing how a car works without knowing about the existence of internal combustion engines.

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