求分析一波祖源

{"result":[{"race_desc":"\u4e2d\u534e\u6c11\u65cf","race_en":"chinese_nation","race_probality":"0.999700","area":[{"block":"chinese_nation","race_desc":"\u5317\u65b9\u6c49\u65cf","race_en":"han_northern","race_probality":"0.590854"},{"block":"chinese_nation","race_desc":"\u5357\u65b9\u6c49\u65cf","race_en":"han_southern","race_probality":"0.260059"},{"block":"chinese_nation","race_desc":"\u8499\u53e4\u8bed\u65cf\u7fa4","race_en":"mongolian","race_probality":"0.145855"},{"block":"chinese_nation","race_desc":"\u9ad8\u5c71\u65cf","race_en":"gaoshan","race_probality":"0.002852"},{"block":"chinese_nation","race_desc":"\u5176\u4ed6","race_en":"other","race_probality":"0.0003"}]},{"race_desc":"\u5176\u4ed6","race_en":"other","race_probality":"0.0003","area":[]}],"case_id":"ANCESTRY","prefix":null,"description":"\u7956\u6e90\u5206\u6790","color":null,"detail_url":"\/report2\/ancestry\/"} 前三代应该都在上海这边，为什么北方汉族比例这么高，还有蒙古族