<!--QuoteBegin-->QUOTE<!--QuoteEBegin-->The caveat that "multiple and repeated" horse domestications were not necessarily independent, seems to be a concession to the "Aryan" theory i.e. that Indo-Europeans still may have been solely responsible for the domestication of the horse in different regions.
Occam's razor would suggest that such an explanation is unlikely, since it requires more steps, and in other similar studies on domestication no such exceptional statement would have been made.
Regards,
Paul Kekai Manansala
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Anim Genet. 2006 Oct;37(5):494-7.
Evidence for biogeographic patterning of mitochondrial DNA sequences in Eastern horse populations.
Equine mitochondrial DNA (mtDNA) phylogeny reconstruction reveals a complex pattern of variation unlike that seen in other large domesticates. It is likely that this pattern reflects a process of multiple and repeated, although not necessarily independent, domestication events. Until now, no clear geographic affiliation of clades has been apparent. In this study, amova analyses have revealed a significant non-random distribution of the diversity among equine populations when seven newly sequenced Eurasian populations were examined in the context of previously published sequences. The association of Eastern mtDNA types in haplogroup F was highly significant using Fisher's exact test of independence (P = 0.00000). For the first time, clear biogeographic partitioning has been detected in equine mtDNA sequence.<!--QuoteEnd--><!--QuoteEEnd-->
Occam's razor would suggest that such an explanation is unlikely, since it requires more steps, and in other similar studies on domestication no such exceptional statement would have been made.
Regards,
Paul Kekai Manansala
---
Anim Genet. 2006 Oct;37(5):494-7.
Evidence for biogeographic patterning of mitochondrial DNA sequences in Eastern horse populations.
Equine mitochondrial DNA (mtDNA) phylogeny reconstruction reveals a complex pattern of variation unlike that seen in other large domesticates. It is likely that this pattern reflects a process of multiple and repeated, although not necessarily independent, domestication events. Until now, no clear geographic affiliation of clades has been apparent. In this study, amova analyses have revealed a significant non-random distribution of the diversity among equine populations when seven newly sequenced Eurasian populations were examined in the context of previously published sequences. The association of Eastern mtDNA types in haplogroup F was highly significant using Fisher's exact test of independence (P = 0.00000). For the first time, clear biogeographic partitioning has been detected in equine mtDNA sequence.<!--QuoteEnd--><!--QuoteEEnd-->