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
2024-02-03
45
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] 【C4】
选项
答案
C
解析
此处应为动词过去式。本句的内容表明实验室的启动“标志”着该公司的第一次扩张,因此答案为marked。
转载请注明原文地址:https://tihaiku.com/zcyy/3417990.html
相关试题推荐
Teachingchildrentoreadwellfromthestartisthemostimportanttaskof
Teachingchildrentoreadwellfromthestartisthemostimportanttaskof
Teachingchildrentoreadwellfromthestartisthemostimportanttaskof
Childrenwhospendmorethantwohoursadayatacomputerorwatchingtelev
Childrenwhospendmorethantwohoursadayatacomputerorwatchingtelev
Tallmenaremorelikelytohavechildrenthantheirverticallychallengedf
Tallmenaremorelikelytohavechildrenthantheirverticallychallengedf
Childrenwhospendmorethantwohoursadayatacomputerorwatchingtelev
Childrenwhospendmorethantwohoursadayatacomputerorwatchingtelev
Childrenwhospendmorethantwohoursadayatacomputerorwatchingtelev
随机试题
Theworldisinaself-destructionmode.BythisstatementImeanthatthepe
助理编辑的职责包括( )等。A.在编辑指导下,搜集整理有关学科的情报、信息,练
某嵌入式控制软件中,通过采集传感器数值来计算输出控制率,同时为提高数据采集的可靠
关于胶片乳剂层叙述错误的是A.主要由卤化银和明胶组成 B.卤化银是产生影像的核
钢中碳的含量超过1.00%时,钢材的性能表现为()。A:塑性大 B:强度下降
目前世界上形成的国际航空客运联盟主要有()。A.星空联盟 B.天合联盟 C
按照中国证监会发布的《上市公司证券发行管理办法》,要求主板(中小企业板)上市的上
转移土地,房屋权属是指下列行为( )。A.国有土地使用权出让 B.土地使用权
有关拜占庭和阿拉伯教育说法错误的是( )A.拜占庭直接继承古罗马、雅典文明
女性,22岁,系统性红斑狼疮5年,近来出现尿蛋白持续(+++),糖皮质激素治疗4
最新回复
(
0
)