推荐回答（5个）
生物的遗传是通过基因传递信息来完成的，基因是遗传的物质基础，通过生殖细胞（精子和卵子）传给后代，从而父母的性状特点在子代得以表达。
根据专家估计，每个正常人身上可能携带有几个甚至十几个有害的隐性等位基因，近亲通婚会使得这些隐性等位基因有更多的相遇机会，并且产生遗传上的异常。人类的核基因组一半来自父亲，一半来自母亲，在近亲通婚的情况下，两个相同的基因结合到一起远远大于非近亲通婚的人。
扩展资料：
近代更有大量资料证明，表亲结婚，痴呆儿发生率比非近亲结婚高150倍，新生儿死亡率和畸形率也比非近亲结婚高3倍多。
还有人报道，近亲结婚者的子女在20岁前死亡者达13.9%，而非近亲结婚仅为1.7%。大量事实证明近亲结婚对后代不利，应当禁止。
为此，我国新婚姻法第七条明确规定，直系血亲和三代以内的旁系血亲禁止婚配。近亲即指有亲缘关系的人，更确切的说是指有不太远共同祖先的人，通常追溯三代。
参考资料来源：百度百科-近亲结婚
参考资料来源：百度百科-近亲
别小看了近亲结婚哦！恰恰相反阻挡它的仅仅是传说会把隐性遗传疾病的几率增加而已！我们民国时还在持续，它和一夫多妻制在中国已经有几千年的历史了！它符合生物学家族体系！生物都是以家族成员为单位来延续后代！
现在提倡一夫一妻制度是西方传过来的，有很大弊端，它给西方带来了很大影响导致不婚族很多还有很多丁克！这直接造成生育率下降、强奸犯罪率高、出轨率高、离婚率高、男女比例失调、孝敬父母和关爱老人也大不如前。其实西方人的浪漫有点过头！优点只有“不占用更多资源”、还有就是那个所谓的隐形遗传疾病的几率“（现代科学已经可以进行基因编辑，如果应用这条可以忽略）。
中国几千年恰恰是近亲结婚并有一夫多妻制，它能有效的减少离婚率均高不下、降低出轨率、和强奸犯罪的几率 ，并且因为是一夫多妻制生育率大大提高。人丁兴旺尊老爱幼，就是这么传承下来的！
我觉得中国未来一定要改善这种制度！现在人为了结婚有套房不惜成为房奴，高昂的礼金，终其一生力量去迎合婚姻，以至于现代中国没有出现过古代李白、杜甫、白居易的这样能够让后代歌颂的伟人，我们这代人能够流传下去给后代的有什么？流行音乐？说唱？还是网红？这非常值得深思！
如果我们科学的改善这种制度就会有很大各个层次的收益！例如如果你想繁衍下一代就一男一女或者二女，想改善基因就去别家叮订婚约！一脉相传！这样人生才能把大把的时间用于创造和精进文明！人类才会向前发展！幸福指数攀升！
全世界都知道近亲结婚的危害，为何在日本十分流行，原因很简单！
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