首页
登录
职称英语
Once they decided to have children, MiShel and Carl Meissner tackled the nex
Once they decided to have children, MiShel and Carl Meissner tackled the nex
游客
2023-07-17
51
管理
问题
Once they decided to have children, MiShel and Carl Meissner tackled the next big issue: Should they try to have a girl? It was no small matter. MiShel’s brother had become blind from a hereditary condition in his early 20s, and the Meissners had learned that the condition is a【1】passed from mothers to sons. If they had a boy, he would have a 50 per cent chance of having the condition. A girl would be【2】.
The British couple’s inquiries about gender selection led them in 1999 to Virginia, US where a new sperm (精子)-separation technique, called MicroSort, was under【3】. When MiShel became pregnant, she gave birth to a daughter. They will try to have a second daughter using the technique later this year.
The technique separates sperm into two groups—those that carry the X-chromosome (producing a female baby) and those that carry the Y-chromosome (producing a male baby). The technology was developed in 1990s, but last month’s opening of a laboratory in California【4】the company’s first expansion.
"We believe the number of people who want this technology is greater than those who have【5】to it," said Keith L. Blauer, the company’s clinical director.
This is not only a【6】effective way to select a child’s gender. It also brings a host of ethical (伦理的) and practical considerations—especially for the majority of families who use the technique for【7】reasons.
The clinic offers sex selection for two purposes: to help couples avoid passing on a gender-linked【8】disease and to allow those who already have a child to "balance" their family by having a baby of the opposite sex.
The technology is still【9】. However, Blauer says the company has an impressive success rate: 91 per cent of the women who become pregnant after sorting for a girl are successful, while 76 per cent who sort for a boy and get pregnant are successful.
The technique separates sperm based on the fact that the X-chromosome is larger than the Y-chromosome. A machine is used to【10】the size differences and sort the sperm accordingly. The result is then checked using another type of DNA analysis to ensure that it contains mostly X-or Y-bearing sperm. The desired sample is then used for artificial insemination (授精) or test tube fertilization.
A. genetic B. overlapped C. marked D. unaffected
E. perpetually F. investigation G. access H. feat
I. disorder J. gropes K. experimental L. seemingly
M. elicit N. nonmedical O. distinguish [br] 【8】
选项
答案
A
解析
此处应为修饰成分,可为名词、形容词或动词的分词。从本文首段提到的个案和本句提到的gender-linked可以推断空白处的单词应表明“遗传性”疾病,因此genetic为本题答案。
转载请注明原文地址:http://tihaiku.com/zcyy/2843528.html
相关试题推荐
InbothChinaandDenmarkchildrenare【S1】______andtheyreceiveagreatdea
InbothChinaandDenmarkchildrenare【S1】______andtheyreceiveagreatdea
InbothChinaandDenmarkchildrenare【S1】______andtheyreceiveagreatdea
InbothChinaandDenmarkchildrenare【S1】______andtheyreceiveagreatdea
Justlikechildren,deeroftencrossBritishroadstogettotheotherside.
Justlikechildren,deeroftencrossBritishroadstogettotheotherside.
Justlikechildren,deeroftencrossBritishroadstogettotheotherside.
Justlikechildren,deeroftencrossBritishroadstogettotheotherside.
Justlikechildren,deeroftencrossBritishroadstogettotheotherside.
Justlikechildren,deeroftencrossBritishroadstogettotheotherside.
随机试题
Shewasextremelylucky;whenhergreat-uncledied,she______afortune.A、cameby
TheU.S.govemmentisopposedtothetransactionbecauseitisafraidthat_____
We’refoundthateatinghabitsvary(变化)somuchthatitdoesnotmakesenset
[originaltext]TheGreatFireofLondonstartedintheveryearlyhoursofS
证见呃逆或干呕,虚烦少气,口干,舌红嫩,脉虚数A.旋覆代赭汤B.黄连泻心汤C.橘
人口统计变量和( )是房地产市场分析中应该选择调查的重要数据。A、环境变量
胆总管下端有阻塞时,T管引出的胆汁为A、量过少,色深 B、浑浊 C、量少而色
断路器应具备远方和就地操作方式。
在直流回路中串入一个电感线圈,回路中的灯就会变暗。
人在每一瞬间,将心理活动选择了某些对象而忽略了另一些对象。这一特点指的是注意的(
最新回复
(
0
)