首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Henry III didn’t know much about biology. He went through six wives back in the 1500s, looking for one who could bear him a son.
Henry III didn’t know much about biology. He went through six wives back in the 1500s, looking for one who could bear him a son.
admin
2018-05-09
105
问题
Henry III didn’t know much about biology. He went through six wives back in the 1500s, looking for one who could bear him a son. Scientists now know that it’s the father’s sperm, not the mother’s egg, which determines whether a baby is a boy or a girl. And last week researchers at the Genetics and IVF Institute, a private fertility (生育能力) center in Virginia, announced a new technique that will allow parents to choose the sex of their baby-to-be, before it has even been conceived. The scientist used a tiny laser detector to measure the DNA in millions of sperm cells as they pass single file through a narrow tube, like cattle being herded through a corral (牲口栏). In a study published last week, "girl sperm," which has more DNA—the genetic material—in each cell, was collected, while "boy sperm" was discarded. And when purified girl sperm was used to impregnate (使受孕) a group of mothers, 15 of 17 resulting babies turned out to be girls.
The researchers say that "sex selection" can also double a mother’s chance of having a son and can be used to avoid genetic diseases that affect only one gender, such as hemophilia (血友病). But some experts, like New York University fertility specialist Dr. Jamie Grifo, worry that sex selection could lead to a kind of in uteri (子宫) discrimination, especially in cultures where sons are considered superior to daughters. "It’s valuing one gender over another," Grifo says. "I don’t think that’s something we should be doing." So far, patients at the institute have been asking for both boys and girls, in order to "balance" their families. And some ethics experts say that’s fine, as long as parents are just looking for a little gender variety. "If you have three boys, and you want a girl," says University of Texas reproductive-law professor John Robertson, "that’s not gender bias at all."
According to this passage, the practice of "sex selection" _____.
选项
A、can help to prevent all genetic problems
B、is totally unacceptable to ethics experts
C、was already realized five hundred years ago
D、will benefit families with certain inheritable diseases
答案
D
解析
推理判断题。第2段第1句中的genetic暗示有些疾病是遗传的,即如选项D所述。第2段第1句同时表明选项A的说法是不全面的。选项B与第2段最后两句正好相反。第1段前两句说明选项C是错误的。
转载请注明原文地址:https://kaotiyun.com/show/rb47777K
0
大学英语四级
相关试题推荐
ArtificialIntelligence(AI)A)Weoftendon’tnoticeit,butartificialintelligence(AT)isallaroundus.Itispresentinco
Peoplewholiveinheavilyindustrializedareasdonotgetasmuchsunlightastheyshould.Dust【C1】______overacityataltitud
Peoplewholiveinheavilyindustrializedareasdonotgetasmuchsunlightastheyshould.Dust【C1】______overacityataltitud
Sixyearsago,aMiamiwomanwalkingthroughthehallofanofficebuildingcasuallynoticedtwomenstandingtogether.Several
SomeyearsagoIwasofferedawritingassignmentthatwouldrequirethreemonthsoftravelthroughEurope.Ihadbeenabroada
SomeyearsagoIwasofferedawritingassignmentthatwouldrequirethreemonthsoftravelthroughEurope.Ihadbeenabroada
SomeyearsagoIwasofferedawritingassignmentthatwouldrequirethreemonthsoftravelthroughEurope.Ihadbeenabroada
SomeyearsagoIwasofferedawritingassignmentthatwouldrequirethreemonthsoftravelthroughEurope.Ihadbeenabroada
Didyouknowthatallhumanbeingshavea"comfortzone"regulatingthedistancetheystandfromsomeonewhentheytalk?Thisdi
随机试题
下列软膏基质中,较适用于有大量渗出液患处使用的软膏基质是
“警戒与治安”是事故应急救援预案中()的二级要素。
在施工用地范围内,将各项生产、生活设施及其他辅助设施进行规划和布置,满足施工组织设计及维持()要求。
某上市公司2015年年底流通在外的普通股股数为5000万股,2016年5月7日派发普通股股利1000万股,2016年7月1日经批准增发普通股250万股,2016年净利润1600万元,其中应付优先股股利200万元,则2016年的基本每股收益为()元。
某企业拥有A、B两栋房产,A栋自用,B栋出租。A、B两栋房产在2012年1月1日时的原值分别为1200万元和1000万元,2012年4月底B栋房产租赁到期。自2012年5月11日起,该企业由A栋搬至B栋办公,同时对A栋房产开始进行大修至年底完工。食业出租B
下列关于合同转让的表述中,正确的选项是()。
教育对政治经济制度的影响表现在()
区域经济协调发展的意义是
根据数据库应用系统生命周期模型,完成数据库关系模式设计的阶段是()。
Today,mostcountriesintheworldhavecanals.Manycountrieshavebuiltcanalsnearthecoast,andparallel【67】thecoast.Even
最新回复
(
0
)