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
11
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] 【3】
选项
答案
F
解析
此处应为名词,可与under搭配,表明精子分离技术的现状。在名词词库中,investigation是最适合本题的词,under investigation表明这种技术正处于发展研究当中。
转载请注明原文地址:https://tihaiku.com/zcyy/2843523.html
相关试题推荐
Teachingtodaydemandsmorethanjustcaringaboutchildrenandknowingone’
Teachingtodaydemandsmorethanjustcaringaboutchildrenandknowingone’
Teachingtodaydemandsmorethanjustcaringaboutchildrenandknowingone’
Teachingtodaydemandsmorethanjustcaringaboutchildrenandknowingone’
Teachingtodaydemandsmorethanjustcaringaboutchildrenandknowingone’
Teachingtodaydemandsmorethanjustcaringaboutchildrenandknowingone’
Teachingtodaydemandsmorethanjustcaringaboutchildrenandknowingone’
Teachingtodaydemandsmorethanjustcaringaboutchildrenandknowingone’
[originaltext]Margaret,marriedwithtwosmallchildren,hasbeenworkingf
[originaltext]ToomuchTV-watchingcanharmchildren’sabilitytolearnand
随机试题
Readinginvolveslookingatgraphicsymbolsandformulatingmentallythesou
Itisimpliedthat,ayearago,______.[br]Whichofthefollowingisinagreem
"Blink"TechnologyA)
当一个大型及复杂项目在()确定后,就需要制订项目计划。A.需求定义 B
现金流是分析的具体内容包括下列各项中的()。 Ⅰ.投资收益分析 Ⅱ.
A.四八 B.五八 C.六八 D.七八 E.八八肝气衰,筋不能动,天癸竭
下列说法中,正确的是( )。A.2015年11月,全国原煤产量超过3.
注意事项 请编辑此处 给定材料 材料1: 中共中央政治局委员,广东省委书
买断式回购发生违约,对违约事实或违约责任存在争议的,交易双方可以协议申请仲裁或者
股票基金与单一股票之间的不同点有()。A.每一交易日股票基金只有一个价格
最新回复
(
0
)