“Out of Africa” in 2019
The figure to the left is from Paleolithic DNA from the Caucasus reveals core of West Eurasian ancestry. It is a graph which captures general features of human population historical relationships as we understand them today. Or at least the model fits the data (remember, many models may fit the data!). The graph is complex…but […]
The Insight Show Notes — Season 2, Episode 15: The Prehistory of the Arabian Peninsula
The Insight Show Notes — Season 2, Episode 15: The Prehistory of the Arabian PeninsulaDhofar, Oman, during the “wet season”This week on The Insight (Apple Podcasts, Stitcher and Google Podcasts)we discuss the prehistory of the Arabian peninsula with ar…
Out of Africa to Out of Eden (well, perhaps not yet)
The recent African origins hypothesis for modern humans had several things going for it. First, most of the old fossils that look like modern humans were in Africa. Chris Stringer and others were pushing the African origins of our modern lineage before genetics came to the fore. But of course, you also have DNA. The […]
Out of Africa-Out of Asia-Out of Africa
Roberta Estes recenty posted about the fact that Spencer & I will be revisiting The Journey of Man, fifteen years after he wrote the book and made the documentary. As part of the preparation, I’m revisiting some uniparental results, in particular, recent ones. This preprint in bioRxiv Carriers of mitochondrial DNA macrohaplogroup L3 basic lineages […]
Out of Africa and out of Siberia
The latest edition of The American Journal of Human Genetics has two papers using “old fashioned” uniparental markers to trace human migration out of Africa and Siberia respectively. I say old fashioned because the peak novelty of these techniques was around 10 years ago, before dense autosomal SNP marker analyses, let alone whole genome sequencing. […]
Out of Africa’s end?
The BBC has a news report up gathering reactions to a new PLoS ONE paper, The Later Stone Age Calvaria from Iwo Eleru, Nigeria: Morphology and Chronology. This paper reports on remains found in Nigeria which date to ~13,000 years B.P. that exhibit a very archaic morphology. In other words, they may not be anatomically […]
Why the human X chromosome is less diverse
The Pith: The human X chromosome is subject to more pressure from natural selection, resulting in less genetic diversity. But, the differences in diversity of X chromosomes across human populations seem to be more a function of population history than …
What one (or more) genomes can tell us
The Pith: We are now moving from the human genome project, to the human genomes project. As more and more full genomes of various populations come online new methods will arise to take advantage of the surfeit of data. In this paper the authors crunch …
“Out of Africa” vs. “Multi-regionalism” revisited
A few months ago I exchanged some emails with Milford H. Wolpoff and Chris Stringer. These are the two figures who have loomed large in paleoanthropology and the origins of modernity human for a generation, and they were keen in making sure that their …
The continuing tangling of the human tree
Last summer I made a thoughtless and silly error in relation to a model of human population history when asked by a reader the question: “which population is most distantly related to Africans?” I contended that all non-African populations…
Where in the world did anatomically modern humans come from?
The Pith: I review a recent paper which argues for a southern African origin of modern humanity. I argue that the statistical inference shouldn’t be trusted as the final word. This paper reinforces previously known facts, but does not add much th…
A ‘leaky’ model
John Farrell pointed me to this Anne Gibbons’ piece, A New View Of the Birth of Homo sapiens. Here’s some interesting passages:
The new picture most resembles so-called assimilation models, which got relatively little attention over the yea…
After the evolutionary revolution
Image credit: Luna04
My post The paradigm is dead, long live the paradigm! expressed to some extent my befuddlement at the current state of human evolutionary genetics and paleoanthropology. After the review of the paper of possible elevated admixtur…
Mapping the “Green Sahara”
Guelta d’Archei, Chad. Credit: Dario Menasce. Everyone who is literate knows that the Sahara desert is the largest of its kind in the world. The chasm in cultural, biological, and physical geography is very noticeable. Northern Africa is part of the Palearctic zone, while the peoples north of the Sahara have long been part of […]
Out of Africa: mend it, don’t end it!
Dilettante human genetics blogger Dienekes Pontikos has a post up with a somewhat oblique title, Is multi-regional evolution dead? I say oblique because a straightforward title would be “Multi-regionalism lives!” He posted a chart from a 2008 paper which outlines various models of human origins, and their relationship to molecular data at the time. I […]
We were all Africans…before the intermission
Quick review. In the 19th century once the idea that humans were derived from non-human ancestral species was injected into the bloodstream of the intellectual classes there was an immediate debate as to the location of the proto-human homeland; the Urheimat of us all. Charles Darwin favored Africa, but in many ways this ran against the […]
One principal component to rule them all?
Despite the reality that I’ve cautioned against taking PCA plots too literally as Truth, unvarnished and without any interpretive juice needed, papers which rely on them are almost magnetically attractive to me. They transform complex patterns of variation which you are not privy to via your gestalt psychology into a two or at most three […]