7. Japanese.
Around 400 B.C., intensive rice agriculture, new pottery styles, and new tools, all based on Korean models, appeared on the southwestmost Japanese island of Kyushu near Korea and spread northeast up the
Japanese archipelago.
Genes and skeletons of the modern Japanese suggest that they arose as a hybrid population between arriving Korean rice farmers and a prior Japanese population similar to the modern Ainu and responsible
for Japan’s earlier Jomon pottery. Modern southwest-to-northeast gene clines in Japan and DNA extracted from ancient
skeletons support this interpretation (59, 60). Japanese origins would thus rival Bantu origins as the most concordant and unequivocal example of an agricultural expansion, were it not for the flagrant discordance of the linguistic
evidence. If Korean farmers really did become dominant in Japan as recently as 400 B.C., one might have expected the modern Japanese and Korean languages to be as closely similar as other languages that diverged at such a recent date (e.g., German and Swedish), whereas their relationship is in fact much more distant.
The likely explanation is language replacement in the Korean homeland. Early Korea consisted of three kingdoms with distinct languages. The modern Korean language is derived from that of the ancient Korean kingdom of Silla, the ingdom that unified Korea. However, the now-extinct language of one of the two ancient Korean kingdoms
that Silla defeated, Koguryo, was much more similar to Old Japanese than is Sillan or modern Korean (61). Thus, a
Koguryo-like language may have been spoken by the Korean farmers arriving in Japan, may have evolved into modern Japanese, and may have been replaced in Korea itself by Sillan that evolved into modern Korean.
Bookmarks