祖先
祖先（粵拼：zou2 sin1），又寫先祖，就係子孫嘅相反，一個人嘅父母，同佢哋對上嘅父母，一直推返上去。不過好多時講祖先，通常都係最少隔幾年。年代久遠嘅就叫遠祖。好多父系社會，祖先只係計阿爸嗰邊。
如果兩個人有共同嘅祖先，咁就會講佢兩個有血緣關係，或者親戚關係。響演化論來講，幾個品種有同一演化祖先，佢哋都係呢個祖先品種嘅子孫。
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