同性恋真的由同性恋基因决定的吗？

xianrujinguangfanrenkeshuangxinglian，yecunyouxuduonantongxinglianwang，youxierenshuangxingliangenyichuanjiyinyoubixudeguanlian，shineiyangdema？

一、双性恋是否由遗传基因决策的吗？

1、发觉同性恋基因

 shuangxinglianzhuangkuangziguyilaizongyou。nantongxinglianwangzairenmendangdaiguangfanchunzai，tongxingliannv，tongxingliannanguangfanquanshi。keshi，duishuangxingliandeyouyinquegebuxiangtong，jianrenjianzhi。dajiachangshicongfenzishengwuxue、shehuixintaixue、shehuixianzhuangdengshijiaobiaoshushuangxinglian，shubuzhidaomuqianweizhi，douhaimei1gezhijiezhengjuchongzu、ganranliqiangdejichulilunlaijishuangxingliandeyouyinxiagexiajielun。rujintongchangjuede，shuangxinglianshitianshenghehoutianxingyaosuxianghugongxiaodejieguo，zaiqizhong，yichuanjiyindebiyaoxingbeihenduodezhijiezhengjusuoshiyong。fajuetongxinglianjiyindeshengwuxuejiadoushitongxingliannan，yingguoyichuanxuejiadeanhamertongxingliannanzuixianmingqueletongxinglianjiyin，yijushuangxinglianqindixiongdexxingranseti，tafajuedingbudemeiduanyichuanjiyinxq28jueceshuangxinglian。zheipianfabiaolunwenzai《science》zhihou，hamerbianchengyiyijiaose，erdangdajialejie，fabubenwendechuangzuozhezijijiushishuoshuangxinglianshi，tichuzhiyishengjiugengbianda。danyihouyouyoujileikexueyanjiushiyonglehamerdeyiju，yezailingyigejitiaoxingransetishangyefajueletongxinglianjiyin。mingshuangxingliankexueyanjiufajue8haoxingranseticunyoutongxinglianjiyinshubuzhijinnianchu，meiguoxibeidaxuedezheixiangdui400mingshuangxingliandnadedazhongxingkexueyanjiufajue，meifagenjuxq28yichuanjiyinlaijingquediyucefenxishuangxinglian，lingwaifajuedi8haoxingransetishangcunyoutongxinglianjiyin，danyeyiyangmeifajingzhunyucefenxi。

2、guoyingdelijingjiyinxiushijiuhuibianweishuangxinglian

 jinguanshengwuxuedekexueyanjiujimeiyouhaowuyiwendoumeiyoufourentongxinglianjiyindecunyou，danlaiyuanyushengwujiedeguanchaquxiangyurentong，youyuzaishengwujiezhongshuangxingliandecunyouhenguangfan，bingqieduiguoyingkaizhanjiyinxiushihou，huicushiguoyingbianweishuangxinglian，weitongxinglianjiyindecunyouchushilelinchuangshiyangenju。ribenshengwuxuejiayixiazijiangcihaozibianlalaribenshengwuxuejiazai2010nianbaodao，shiguanpeitaiqichuqucichonghaozide1geduoyangxingyichuanjiyin——fucm，kerangcichonghaozibianweilala——tamenhuijueyixingpengyoudeshiai，bingchangshiyunantongpeizhong。yuanxian，fucmyichuanjiyinweihailecixingjisushuizhun，congershirendedanaozaoshouweihai。

二、双性恋没法生孩子，那遗传基因怎样广为流传出来呢？

 shuangxinglianzhanquntidezhanbiwei5%dao15%zhongjian，jiaruzhenyoutongxinglianjiyincunyoudehua，congchaojinhuashanghaoxiangmeibanfabiaoshu，youyushuangxinglianburongyiyouzisunhoudai，zheizhongyichuanjiyinburongyiguangweiliuchuanchulai，gengbutaikenengyouneimedadezhanbi。zheileiyichuanjiyinbulirenmenfanzhi，shiyingdangbeichaojinhuajibaide。neimashuangxingliandeqianzaixingyichuanjiyinquxiangdaodiweihenengchixuchulai？renmenrengmeiyouxunzhaocankaodaan。danshiyanbianxuejiamingquetichuhaoduogeshifenyoufazhanqianlidelilun：

1、亲缘挑选理论

 zhuanjiatuiduan，zaochenglitazhuyideyichuanjiyinxiezhuleyoujiyinyichuanguanliandejiashu，jinershihoumianyizhongdelitayichuanjiyinjubeilejiyinyichuanyoudian，litazhuyibianzuyichixu。yiyangdedadaoliyejianghuishiyongshuangxinglian：shuangxingliangerenwuxuzaiqibenshendefanyushangzijintourushijianhehuoli，yexutamenjiukeyixiezhuqinpenghaoyoufuyangzisunhoudai，erzuihoushizheizhongxiaohaishoushangqianzaixingdeshuangxinglianquxiangyichuanjiyinzaiyanbianzhonghuoyi。zheixiangkexueyanjiunanduanzhongguotaipingyangsamoyaqundaodenantongxinglianzheweilingyibankaizhanlediaoyan。samoyashi1gegengweichuantongshideshehuifazhan，bendidenantongxinglianzhebeichengzuo “fa