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
2024-01-29
35
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【C1】______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【C2】______.
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【C3】______. 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【C4】______the company’s first expansion.
"We believe the number of people who want this technology is greater than those who have【C5】______to it," said Keith L. Blauer, the company’s clinical director.
This is not only a【C6】______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【C7】______reasons.
The clinic offers sex selection for two purposes: to help couples avoid passing on a gender-linked【C8】______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【C9】______. 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【C10】______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] 【C8】
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:https://tihaiku.com/zcyy/3405110.html
相关试题推荐
DevelopHealthyEatingHabitsinYourChildrenA)Whatdoyouthinkyour
DevelopHealthyEatingHabitsinYourChildrenA)Whatdoyouthinkyour
DevelopHealthyEatingHabitsinYourChildrenA)Whatdoyouthinkyour
DevelopHealthyEatingHabitsinYourChildrenA)Whatdoyouthinkyour
DevelopHealthyEatingHabitsinYourChildrenA)Whatdoyouthinkyour
Inbringingupchildren,everyparentwatcheseagerlythechild’sacquisitio
Inbringingupchildren,everyparentwatcheseagerlythechild’sacquisitio
It’snosecretthatmanychildrenwouldbehealthierandhappierwithadopti
It’snosecretthatmanychildrenwouldbehealthierandhappierwithadopti
It’snosecretthatmanychildrenwouldbehealthierandhappierwithadopti
随机试题
Waterscootersarewatervehiclesthatlookverymuchlikemotorcycles.Nowa
Whichofthefollowingitalicizedpartsisusedasanobjectcomplement?A、Havey
1.题目:九年级上册《拜占庭帝国的灭亡》 2.内容: 从7世纪起,阿拉伯人不
嵌入式操作系统的主要特点是微型化、()。A.可定制、实时性、高可靠性和易移植性
女,55岁,3月前曾行胆总管十二指肠吻合术。l天前突然出现有上腹痛、寒战、高热,
下列不属于COPD发病机制的是A、酸碱失衡机制 B、自主神经功能失调机制
突出重点法对导游讲解的好处是能使讲解()。A.条理清楚 B.层次分明 C.结
银行承兑汇票的承兑银行,应当按照票面金额向出票人收取()的手续费。A:千分之一
某企业安全处组织安全员学习统计学基础知识,培训教师介绍统计图是一种形象的统计描述
“管理费用”明细账应采用()。A、三栏式 B、多栏式 C、数量金额式 D、
最新回复
(
0
)