Tag: Cladistics

The Bushmen are not primitive! (not necessarily)

By Razib Khan | September 30, 2010 2:38 am

324_1035_F1To the left is a figure from the 2009 paper The Genetic Structure and History of Africans and African Americans. This paper happens to have excellent coverage of African populations, and the figure is a phylogenetic tree generated from distances between those populations, as well as some non-African ones. I’ve labelled the broad clusters. The Bushmen* branch off first, along with the Pygmies. The other clade represents all other humans, African and non-African. Following the non-Bushmen/Pygmy clade down its branching pattern all non-Africans eventually go their own way, and differentiate into their various groups. South Asians form a clade with Europeans and Middle Easterners. East Asians, Native Americans, and more broadly Oceanians, form their own clade. Outside of Africa you basically have a west vs. east & further east division.

These trees are essential in helping us visualize genetic relationships. Tables of pairwise distances are simply not as informative as representations of the data for the human mind. More colloquially, they blow. Trees and two-dimensional plots are much better representations of the data which we can digest in a more gestalt fashion. We see, therefore we know. Ah, but even the innocent tree can lead a mind astray. Or at least this particular tree. So let’s try something different.

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CATEGORIZED UNDER: Evolution
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