为什么我一个南方人蒙古族基因这么多?

{"result":[{"race_desc":"\u4e2d\u534e\u6c11\u65cf","race_en":"chinese_nation","race_probality":"0.963188","area":[{"block":"chinese_nation","race_desc":"\u5357\u65b9\u6c49\u65cf","race_en":"han_southern","race_probality":"0.674297"},{"block":"chinese_nation","race_desc":"\u8499\u53e4\u8bed\u65cf\u7fa4","race_en":"mongolian","race_probality":"0.252238"},{"block":"chinese_nation","race_desc":"\u901a\u53e4\u65af\u65cf\u7fa4","race_en":"tungus","race_probality":"0.026812"},{"block":"chinese_nation","race_desc":"\u85cf\u65cf","race_en":"tibetan","race_probality":"0.009761"},{"block":"chinese_nation","race_desc":"\u5176\u4ed6","race_en":"other","race_probality":"0.0002"}]},{"race_desc":"\u4e1c\u5317\u4e9a","race_en":"ne_asian","race_probality":"0.032541","area":[{"block":"ne_asian","race_desc":"\u65e5\u672c","race_en":"japanese","race_probality":"0.023447"},{"block":"ne_asian","race_desc":"\u97e9\u56fd","race_en":"korean","race_probality":"0.009084"},{"block":"ne_asian","race_desc":"\u5176\u4ed6","race_en":"other","race_probality":"0.0001"}]},{"race_desc":"\u7f8e\u6d32","race_en":"american","race_probality":"0.004030","area":[{"block":"american","race_desc":"\u56e0\u7ebd\u7279\u4eba","race_en":"eskimo","race_probality":"0.004010"}]},{"race_desc":"\u5176\u4ed6","race_en":"other","race_probality":"0.0004","area":[]}],"case_id":"ANCESTRY","prefix":null,"description":"\u7956\u6e90\u5206\u6790","color":null,"detail_url":"\/report2\/ancestry\/"}

原本预想江南应该以南北方汉族基因为主，现在测出来将近30的蒙古通古斯基因，一点北汉也没有，真想不通求大神解读

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