研究：父亲年龄大 孩子长得丑
<p>研究发现，父亲年龄大的孩子相貌也较丑，但是这些丑孩子的寿命却会比其他人长。</p><p>研究指出，45岁以上的男人生出的孩子患自闭症和精神疾病的风险比其他孩子更高。父亲年龄越大，基因突变的概率也会成倍增加。</p><p>相比之下，母亲遗传给孩子的基因最多只会发生15个突变，不管母亲年龄多大。</p><p>科学家称，22岁的父亲生出的孩子比40岁的父亲生出的孩子相貌水平要高出5%到10%。</p><p><span word="Older">Older</span> <span word="fathers">fathers</span> <span word="have">have</span> <span word="uglier">uglier</span> <span word="children">children</span>, <span word="researchers">researchers</span> <span word="have">have</span> <span word="claimed">claimed</span> <span word="after">after</span> <span word="linking">linking</span> <span word="age">age</span> <span word="to">to</span> <span word="genetic">genetic</span> <span word="mutations">mutations</span>.</p><p><span word="The">The</span> <span word="finding">finding</span> <span word="comes">comes</span> <span word="weeks">weeks</span> <span word="after">after</span> <span word="leading">leading</span> <span word="scientists">scientists</span> <span word="reported">reported</span> <span word="children">children</span> <span word="born">born</span> <span word="to">to</span> <span word="men">men</span> <span word="over">over</span> <span word="the">the</span> <span word="age">age</span> <span word="of">of</span> 45 <span word="run">run</span> <span word="a">a</span> <span word="higher">higher</span> <span word="risk">risk</span> <span word="of">of</span> <span word="having">having</span> <span word="autism">autism</span> <span word="and">and</span> <span word="psychiatric">psychiatric</span> <span word="disorders">disorders</span>.</p><p><span word="With">With</span> <span word="age">age</span>, <span word="sperm">sperm</span>-<span word="producing">producing</span> <span word="cells">cells</span> <span word="do">do</span> <span word="not">not</span> <span word="copy">copy</span> <span word="a">a</span> <span word="man">man</span>'<span word="s">s</span> <span word="DNA">DNA</span> <span word="as">as</span> <span word="effectively">effectively</span>, <span word="leading">leading</span> <span word="to">to</span> <span word="genetic">genetic</span> <span word="mutations">mutations</span>.</p><p><span word="Martin">Martin</span> <span word="Fielder">Fielder</span>, <span word="an">an</span> <span word="anthropologist">anthropologist</span> <span word="at">at</span> <span word="Vienna">Vienna</span> <span word="University">University</span>, <span word="told">told</span> <span word="the">the</span> <span word="Sunday">Sunday</span> <span word="Times">Times</span>: '<span word="Every">Every</span> 16 <span word="years">years</span> <span word="the">the</span> <span word="mutation">mutation</span> <span word="rate">rate</span> <span word="doubles">doubles</span>. <span word="Other">Other</span> <span word="researchers">researchers</span> <span word="found">found</span> 25 <span word="mutations">mutations</span> <span word="per">per</span> <span word="sperm">sperm</span> <span word="in">in</span> <span word="a">a</span> 20-<span word="year">year</span>-<span word="old">old</span>, <span word="but">but</span> <span word="at">at</span> <span word="age">age</span> 40 <span word="it">it</span> <span word="is">is</span> 65 <span word="mutations">mutations</span>. <span word="By">By</span> 56, <span word="it">it</span> <span word="doubles">doubles</span> <span word="again">again</span>.</p><p>'<span word="The">The</span> <span word="effect">effect</span> <span word="is">is</span> <span word="very">very</span> <span word="visible">visible</span> - <span word="someone">someone</span> <span word="born">born</span> <span word="to">to</span> <span word="a">a</span> <span word="father">father</span> <span word="of">of</span> 22 <span word="is">is</span> <span word="already">already</span> 5-10 <span word="per">per</span> <span word="cent">cent</span> <span word="more">more</span> <span word="attractive">attractive</span> <span word="than">than</span> <span word="those">those</span> <span word="with">with</span> <span word="a">a</span> 40-<span word="year">year</span>-<span word="old">old</span> <span word="father">father</span> <span word="and">and</span> <span word="the">the</span> <span word="difference">difference</span> <span word="grows">grows</span> <span word="with">with</span> <span word="the">the</span> <span word="age">age</span> <span word="gap">gap</span>.'</p><p><span word="In">In</span> <span word="contrast">contrast</span>, <span word="women">women</span> <span word="pass">pass</span> <span word="on">on</span> <span word="a">a</span> <span word="maximum">maximum</span> <span word="of">of</span> 15 <span word="mutations">mutations</span> <span word="to">to</span> <span word="their">their</span> <span word="baby">baby</span>, <span word="regardless">regardless</span> <span word="of">of</span> <span word="age">age</span>, <span word="according">according</span> <span word="to">to</span> <span word="the">the</span> <span word="study">study</span> <span word="published">published</span> <span word="in">in</span> <span word="the">the</span> <span word="journal">journal</span> <span word="Nature">Nature</span>.</p>
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