首页
登录
职称英语
Henry III didn’t know much about biology. He went through six wives back in
Henry III didn’t know much about biology. He went through six wives back in
游客
2023-07-17
48
管理
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." [br] 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://tihaiku.com/zcyy/2843678.html
相关试题推荐
Japanisgoingthroughacomplexnationalidentitycrisis.Thatmaybenoba
Japanisgoingthroughacomplexnationalidentitycrisis.Thatmaybenoba
Japanisgoingthroughacomplexnationalidentitycrisis.Thatmaybenoba
Hadheworkedharder,______(他就通过考试了).hewouldhavegotthroughtheexams“通过考试”用g
Throughouthistorythebasicunitofalmosteveryhumansocietyhasbeenthe
Throughouthistorythebasicunitofalmosteveryhumansocietyhasbeenthe
Throughouthistorythebasicunitofalmosteveryhumansocietyhasbeenthe
Throughouthistorythebasicunitofalmosteveryhumansocietyhasbeenthe
Throughouthistorythebasicunitofalmosteveryhumansocietyhasbeenthe
Knowledgemaybeacquiredthroughconversation,watchingtelevisionortrave
随机试题
Thereisaphenomenainthepresent.Theaveragenumberofauthorsonscien
采用牢固内固定后发现骨折端X线摄影无骨痂,形成无外骨痂的骨愈合,称为:(
(2019年真题)关于股权投资基金的募集方式,表述正确的是()A.获得中国
与负债筹资相比,发行普通股筹资的特点是( )。[2010年初级真题]A.具有抵
患者,男性,42岁。误服敌百虫后大汗淋漓,瞳孔缩小,肌肉抽搐,血压110/82m
能发现早期肾癌的常规体检项目是A.B超检查 B.CT检查 C.MRI检查
尿道损伤后最易造成的并发症是A:尿瘘 B:尿道狭窄 C:慢性尿道周围脓肿
张某欲购买一套住房,委托甲房地产经纪机构(以下简称甲机构)寻找房源并签订了经纪合
上颌骨骨折发生骨移位的最佳复位时间为A.2个月之内 B.1个月之内 C.2周
下列各项中,不得作为纳税保证人的是()。A.有纳税担保能力的组织 B.有纳税
最新回复
(
0
)