想要生对双胞胎？还得看你基因怎么说
<p><span word="Twins">Twins</span>, <span word="and">and</span> <span word="the">the</span> <span word="reasons">reasons</span> <span word="behind">behind</span> <span word="why">why</span> <span word="some">some</span> <span word="people">people</span> <span word="have">have</span> <span word="them">them</span> <span word="and">and</span> <span word="others">others</span> <span word="don">don</span>'<span word="t">t</span>, <span word="has">has</span> <span word="fascinated">fascinated</span> <span word="scientists">scientists</span> <span word="for">for</span> <span word="centuries">centuries</span>.</p><p>双胞胎本身，以及为什么有的人能生出双胞胎有的人却不能，几个世纪以来一直是科学家感兴趣的问题。</p><p><span word="They">They</span> <span word="are">are</span> <span word="relatively">relatively</span> <span word="common">common</span> - <span word="occurring">occurring</span> <span word="once">once</span> <span word="in">in</span> 100 <span word="pregnancies">pregnancies</span> - <span word="and">and</span> <span word="while">while</span> <span word="the">the</span> <span word="cause">cause</span> <span word="of">of</span> <span word="non">non</span>-<span word="identical">identical</span> <span word="twins">twins</span> <span word="has">has</span> <span word="been">been</span> <span word="linked">linked</span> <span word="to">to</span> <span word="genetics">genetics</span>, <span word="the">the</span> <span word="genes">genes</span> <span word="involved">involved</span> <span word="had">had</span> <span word="not">not</span> <span word="been">been</span> <span word="identified">identified</span> <span word="until">until</span> <span word="now">now</span>.</p><p>双胞胎近年来相对来说更加普遍了，每100个产妇中就会有1位怀有双胞胎。虽然已经有证据证明异卵双生与遗传因素有关，但至今还没有人成功鉴别出自发性异卵双生的基因。</p><p><span word="Researchers">Researchers</span> <span word="have">have</span> <span word="pinpointed">pinpointed</span> <span word="two">two</span> <span word="gene">gene</span> <span word="varians">varians</span> <span word="related">related</span> <span word="to">to</span> <span word="twinning">twinning</span>, <span word="and">and</span> <span word="one">one</span> <span word="can">can</span> <span word="play">play</span> <span word="a">a</span> <span word="major">major</span> <span word="role">role</span> <span word="in">in</span> <span word="the">the</span> <span word="age">age</span> <span word="of">of</span> <span word="a">a</span> <span word="girl">girl</span>'<span word="s">s</span> <span word="first">first</span> <span word="period">period</span>, <span word="age">age</span> <span word="at">at</span> <span word="menopause">menopause</span> <span word="and">and</span> <span word="infertility">infertility</span>.</p><p>研究人员已经发现了两种与双胞胎有关的基因变异，其中一种对女孩的月经初潮年龄、更年期年龄与生育能力起着非常重要的作用。</p><p>想要双胞胎?得问问你的基因答应不答应!</p><p><span word="The">The</span> <span word="breakthrough">breakthrough</span> <span word="was">was</span> <span word="made">made</span> <span word="by">by</span> <span word="Dr">Dr</span> <span word="Hamdi">Hamdi</span> <span word="Mbarek">Mbarek</span> <span word="and">and</span> <span word="Professor">Professor</span> <span word="Dorret">Dorret</span> <span word="Boomsma">Boomsma</span> <span word="from">from</span> <span word="the">the</span> <span word="Vrije">Vrije</span> <span word="Universiteit">Universiteit</span> <span word="in">in</span> <span word="Amsterdam">Amsterdam</span>.</p><p>这项重大突破是由阿姆斯特丹大学的哈姆迪·穆巴拉克博士和多雷特·博穆萨教授发现的。</p><p><span word="The">The</span> <span word="first">first</span> <span word="gene">gene</span> <span word="variant">variant</span> <span word="is">is</span> <span word="close">close</span> <span word="to">to</span> <span word="the">the</span> <span word="gene">gene</span> <span word="coding">coding</span> <span word="for">for</span> <span word="the">the</span> <span word="secretion">secretion</span> <span word="of">of</span> <span word="follicle">follicle</span> <span word="stimulating">stimulating</span> <span word="hormone">hormone</span>, <span word="called">called</span> <span word="the">the</span> <span word="FSHB">FSHB</span> <span word="gene">gene</span>. <span word="This">This</span> <span word="hormone">hormone</span> <span word="is">is</span> <span word="released">released</span> <span word="by">by</span> <span word="the">the</span> <span word="pituitary">pituitary</span>, <span word="the">the</span> <span word="small">small</span> <span word="brain">brain</span> <span word="region">region</span> <span word="that">that</span> <span word="governs">governs</span> <span word="almost">almost</span> <span word="all">all</span> <span word="major">major</span> <span word="hormonal">hormonal</span> <span word="events">events</span> <span word="in">in</span> <span word="the">the</span> <span word="body">body</span>.</p>
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