Our evolutionary history is full of interspecies.
Human ancestors seem to have far more species than previously recognized by anthropologists. Neanderthals Hybrid with modern people. Homo sapiens Have sex with Denisovans.
“This continues the story we’ve been seeing in research for the past ten years: many humans have crossed more than ever before,” anthropologist and lead author of the new study, Alan Rogers, told ” Business Insider.
“This discovery pushes the time depth of these crosses farther.”
Based on research by his team, published in the magazine today Scientific progressThis is a newly discovered hybridization event that occurred in Eurasia and is the earliest known example of mating between different populations of ancient humans.
This analysis compared the DNA of Neanderthals, Denisovans, and modern humans in Europe and Africa, further confirming the idea that our ancestor’s genes [and our own genes] came from countless sources.
The oldest hybrid history in anthropological records
Then one 2018 study Studies have shown that Denisovans, which disappeared about 50,000 years ago, passed on some of its genes to Homo sapiens.
But Rogers and his colleagues discovered the crossbreeding event well before it. In this case, a group of people were the ancestors of the Neanderthals and Denisova [the authors of the study nicknamed them “Neanderthians”] crossed with their predecessor species about 744,000 years ago.
These predecessors, in turn, are part of Eurasian “super-old” groups, which range in size from 20,000 to 50,000.
Therefore, the main significance of this study is that in our long evolutionary history, humans have migrated from Africa to Eurasia three times: once 1.9 million years ago, once again 700,000 years ago, and last time 50,000 Years ago.
The first of these waves involved “super quaint”. Then Neanderthol mortal followed 700,000 years ago. Studies say they are likely to migrate northward after separation from modern human bloodlines.
The researchers wrote that when the second wave of ancestors entered Eurasia, they were likely to “crossbreed with local Eurasians, largely replacing them, and divided them into Eastern and Western Yanisova and Neanderthals. Special person “.
Hundreds of thousands of years later, modern humans left Africa, crossed with the Neanderthals and eventually the Denisovans, and spread across Eurasia.
The authors of the study wrote: “About 50,000 years ago, as modern humans expanded from Africa to Eurasia, which largely replaced Neanderthals and Denisovans, these incidents happened again. ”
A group of “super ancient humans”
The Rogers team’s findings came after comparing publicly available modern human DNA with ancient DNA. Analysis has shown that genetic material has been transferred from one human species to another in at least four watershed moments in the past million years.
Three of these moments coincide with the results of other studies. But the oldest examples are newly discovered.
In addition to representing the oldest evidence of recorded human crosses, this finding is surprising because the two mating populations are far less closely related to other human populations previously known to cross.
When modern humans and Neanderthals crossed, they were separated at about 750,000 years in the phylogenetic tree, while newly discovered populations and Neanderthals were separated by more than 1 million years.
However, some mysteries remain. Rogers’s team is not sure what ancient species the hyper-Paleocenes belong to.
All they know is genetic evidence that the super-ancient has been separated from our human bloodline, about 2 million years ago, and that ancient humans lived on Eurasia when species separation occurred.
“We have evidence of human fossils in Eurasia, going back to 1.85 million years ago,” Rogers said.
During the period when parapaleontology was separated from our lineage, at least two groups of humans or groups lived on Eurasia. Homo erectus was the first one of our ancestors to walk upright
. Another possible taxonomy is the erect young cousin, a senior, who lives in modern Spain.
“Either of these classifications could be super-old,” Rogers said. “Or they could be some taxon we don’t know.”
Rogers said, but no matter what ethnic group the superarcheology belongs to, the new evidence of hybridization gives people a glimpse into the ancient times that researchers have little-known about.
“We just unveiled the mystery in an unprecedented time in the history of human evolution,” he said.
This article was originally written by Business insider.
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