【文摘】男性生物钟

Tick-tock, tick-tock. Is that your biological clock? And if it is, are you female? Most people think biological clocks are strictly¹ female phenomena², with infertility³ and the risk of certain diseases going up with a mother's age. But the biological clock is an equal opportunity timepiece--that's right, men have one too!  
There's a common belief that men can sire children until they die, but that women need to be relatively⁴ young to conceive healthy children. But the father's age affects the child's health too. Psychiatrist⁵ Dolores Malaspina and her team found that the risk of schizophrenia triples for babies born to fathers over 50, compared with fathers under 25. Other diseases appearing more in offspring of older fathers are achondroplasia, or dwarfism, and some prostate cancers.

Despite the publicity⁶ given to women's biological clocks, medical geneticists recently have found that sperm⁹ are more likely than eggs to have genetic⁸ mutations. Here's why. By age 40, a man's sperm cells have divided over 600 times. That's over 600 chances for mistakes in copying genes¹⁰. A woman's eggs, on the other hand, don't go through that process of division, so there are fewer chances for mistakes in gene⁷ replication. When there is a genetic problem in an egg, though, it's often with a whole chromosome¹¹, instead of a single gene. Down syndrome¹², for example, occurs when there's an extra copy of chromosome 21. Most babies with older fathers, as with older mothers, are healthy. Still, biological clocks are real, and not just for women. His biological clock is ticking too!

1 strictly   

adv.严厉地，严格地；严密地

参考例句：

• His doctor is dieting him strictly.他的医生严格规定他的饮食。
• The guests were seated strictly in order of precedence.客人严格按照地位高低就座。

2 phenomena   

n.现象

参考例句：

• Ade couldn't relate the phenomena with any theory he knew.艾德无法用他所知道的任何理论来解释这种现象。
• The object of these experiments was to find the connection,if any,between the two phenomena.这些实验的目的就是探索这两种现象之间的联系，如果存在着任何联系的话。

3 infertility   

n.不肥沃，不毛；不育

参考例句：

• It is the Geneva, Switzerland-based Biotech Company's second recombinant infertility drug. 它是瑞士生物技术公司在日内瓦的公司生产的第二种重组治疗不孕症的药。 来自英汉非文学 - 生命科学 - 生物技术制药疫苗
• Endometritis is a cause of infertility. 子宫内膜炎是不育的原子。 来自辞典例句

4 relatively   

adv.比较...地，相对地

参考例句：

• The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
• The operation was relatively painless.手术相对来说不痛。

5 psychiatrist   

n.精神病专家；精神病医师

参考例句：

• He went to a psychiatrist about his compulsive gambling.他去看精神科医生治疗不能自拔的赌瘾。
• The psychiatrist corrected him gently.精神病医师彬彬有礼地纠正他。

6 publicity   

n.众所周知，闻名；宣传，广告

参考例句：

• The singer star's marriage got a lot of publicity.这位歌星的婚事引起了公众的关注。
• He dismissed the event as just a publicity gimmick.他不理会这件事，只当它是一种宣传手法。

7 gene   

n.遗传因子，基因

参考例句：

• A single gene may have many effects.单一基因可能具有很多种效应。
• The targeting of gene therapy has been paid close attention.其中基因治疗的靶向性是值得密切关注的问题之一。

8 genetic   

adj.遗传的，遗传学的

参考例句：

• It's very difficult to treat genetic diseases.遗传性疾病治疗起来很困难。
• Each daughter cell can receive a full complement of the genetic information.每个子细胞可以收到遗传信息的一个完全补偿物。

9 sperm   

n.精子，精液

参考例句：

• Only one sperm fertilises an egg.只有一个精子使卵子受精。
• In human reproduction,one female egg is usually fertilized by one sperm.在人体生殖过程中，一个精子使一个卵子受精。

10 genes   

n.基因( gene的名词复数 )

参考例句：

• You have good genes from your parents, so you should live a long time. 你从父母那儿获得优良的基因，所以能够活得很长。 来自《简明英汉词典》
• Differences will help to reveal the functions of the genes. 它们间的差异将会帮助我们揭开基因多种功能。 来自英汉非文学 - 生命科学 - 生物技术的世纪

11 chromosome   

n.染色体

参考例句：

• Chromosome material with exhibits of such behaviour is called heterochromatin.表现这种现象的染色体物质叫做异染色质。
• A segment of the chromosome may become lost,resulting in a deletion.染色体的一个片段可能会丢失，结果产生染色体的缺失。

12 syndrome   

n.综合病症；并存特性

参考例句：

• The Institute says that an unidentified virus is to blame for the syndrome. 该研究所表示,引起这种综合症的是一种尚未确认的病毒。
• Results indicated that 11 fetuses had Down syndrome. 结果表明有11个胎儿患有唐氏综合征。