{"id":74717,"date":"2012-10-31T01:52:28","date_gmt":"2012-10-31T09:52:28","guid":{"rendered":"http:\/\/blogs.discovermagazine.com\/gnxp\/?p=18937"},"modified":"2012-10-31T01:52:28","modified_gmt":"2012-10-31T09:52:28","slug":"r1a1a-conquers-the-worldin-a-few-pulses","status":"publish","type":"post","link":"https:\/\/www.razib.com\/wordpress\/2012\/10\/31\/r1a1a-conquers-the-worldin-a-few-pulses\/","title":{"rendered":"R1a1a conquers the world\u2026in a few pulses?"},"content":{"rendered":"<p><a href=\"http:\/\/blogs.discovermagazine.com\/gnxp\/files\/2012\/10\/800px-R1a1a_distribution.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-18938\" title=\"800px-R1a1a_distribution\" src=\"http:\/\/blogs.discovermagazine.com\/gnxp\/files\/2012\/10\/800px-R1a1a_distribution.jpg\" alt=\"\" width=\"600\" height=\"388\" \/><\/a><\/p>\n<p>As many of you know around the year 2000 the analyses of Y chromosomal human lineages became a pretty big deal. The reason these lineages are important and useful is that they record the uninterrupted ancestry of males, from father to son, along the Y chromosome. Instead of the complexities of the whole genome, as with mtDNA you have a simple and elegant phylogenetic tree to interpret. The clusters along this tree are defined as broad haplogroups, united by derived states from a common ancestor. One of the largest haplogroups is <a href=\"http:\/\/en.wikipedia.org\/wiki\/R1a1#R1a1a_.28R-M17_or_R-M198.29\">R1a1a<\/a>. It happens to be my paternal lineage, as well as <a href=\"http:\/\/www.macarthurlab.org\/\">Dr. Daniel MacArthur&#8217;s<\/a> and <a href=\"http:\/\/www.harappadna.org\/\">Dr. Zack Ajmal&#8217;s<\/a>.<\/p>\n<p>The map above illustrates the peculiarity of R1a1a: <strong>it is geographically enormously expansive<\/strong>. How to explain this distribution? A naive response might be that this distribution is surprising similar to that of the <a href=\"http:\/\/en.wikipedia.org\/wiki\/Indo-European_languages\">Indo-European languages<\/a>. Unfortunately this runs up against the conundrum that low caste South Indian groups, relatively untouched by Indo-Aryan culture (at least until the past few hundred years), also manifest high frequencies of R1a1a.<\/p>\n<p>To make a long story short it seems that R1a1a is an &#8230;<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/feeds.feedburner.com\/~r\/GeneExpressionBlog\/~4\/yTkiRENYjeI\" height=\"1\" width=\"1\"\/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>As many of you know around the year 2000 the analyses of Y chromosomal human lineages became a pretty big deal. The reason these lineages are important and useful is that they record the uninterrupted ancestry of males, from father to son, along the Y&#8230;<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,2148],"tags":[],"class_list":["post-74717","post","type-post","status-publish","format-standard","hentry","category-anthroplogy","category-r1a1a"],"_links":{"self":[{"href":"https:\/\/www.razib.com\/wordpress\/wp-json\/wp\/v2\/posts\/74717","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.razib.com\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.razib.com\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.razib.com\/wordpress\/wp-json\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/www.razib.com\/wordpress\/wp-json\/wp\/v2\/comments?post=74717"}],"version-history":[{"count":11,"href":"https:\/\/www.razib.com\/wordpress\/wp-json\/wp\/v2\/posts\/74717\/revisions"}],"predecessor-version":[{"id":74799,"href":"https:\/\/www.razib.com\/wordpress\/wp-json\/wp\/v2\/posts\/74717\/revisions\/74799"}],"wp:attachment":[{"href":"https:\/\/www.razib.com\/wordpress\/wp-json\/wp\/v2\/media?parent=74717"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.razib.com\/wordpress\/wp-json\/wp\/v2\/categories?post=74717"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.razib.com\/wordpress\/wp-json\/wp\/v2\/tags?post=74717"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}