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
64
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."
The gender of the baby is decided by_____.
选项
A、the father’s DNA
B、the mother’s DNA
C、the father’s sperm
D、the mother’s egg
答案
C
解析
事实细节题。第1段第3句which引导的非限制性定语从句修饰的是the father’s sperm,而不是插入语the mother’s egg,因此选项Ct确。
转载请注明原文地址:https://kaotiyun.com/show/gb47777K
0
大学英语四级
相关试题推荐
ArtificialIntelligence(AI)A)Weoftendon’tnoticeit,butartificialintelligence(AT)isallaroundus.Itispresentinco
Manyprivateinstitutionsofhighereducationaroundthecountryareindanger.Notallwillbesaved,andperhapsnotalldeser
Peoplewholiveinheavilyindustrializedareasdonotgetasmuchsunlightastheyshould.Dust【C1】______overacityataltitud
Peoplewholiveinheavilyindustrializedareasdonotgetasmuchsunlightastheyshould.Dust【C1】______overacityataltitud
WhichAttributesofaFoodProductAreMostImportanttoConsumers?A)TheAustralianstateofVictoriaisinvestinginapro
WhichAttributesofaFoodProductAreMostImportanttoConsumers?A)TheAustralianstateofVictoriaisinvestinginapro
SomeyearsagoIwasofferedawritingassignmentthatwouldrequirethreemonthsoftravelthroughEurope.Ihadbeenabroada
SomeyearsagoIwasofferedawritingassignmentthatwouldrequirethreemonthsoftravelthroughEurope.Ihadbeenabroada
Fortheemployee,beingplacedinapositionthatiscomfortableandmeetsexpectationswillmakethejoblessstressfulandall
随机试题
湿邪致病往往缠绵难愈,是由于
当下颌弓明显大于上颌弓时,全口义齿人造牙排成反颌关系的主要目的()
煤矿安全监察机构发现煤矿有()情形的,应当处以责令限期改正。
施工企业在施工现场搭设临时设施的支出应列入()。
下列事项中,必须经有限责任公司股东会决议并经代表2/3以上表决权的股东通过的是()。
Iamdelightedtoguestatthisfestiveoccasioncelebratingthe50thanniversaryofdiplomaticrelationsbetweenFinlandandth
CD音频是一种数字化声音,采用立体声存储,其量化级位数是
GreenRoofResearchTheconceptofgreenroofsisbasicallyaboutgrowingplantsonroofs,thushelpingtoreplacethegreen
Questions11-15Readthefollowingtext.Arethesentences11-15"right"or"wrong"?Ifthereisnotenoughinforma
Thegreatchariotofsociety,whichforsolonghadrundownthegentleslopeoftradition,nowfounditselfpoweredbyaninter
最新回复
(
0
)