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
2020-01-09
4
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://jikaoti.com/ti/zi0FFFFM
0
大学英语四级
相关试题推荐
A、BecausepeopleinthatperiodbelievedinthepowerofGod.B、Becausepeopleinthatperiodbelievedinthepowerofmankind.
HowtoFixtheInternetA)Wehavetofixtheinternet.After40years,ithasbeguntocorrode,bothitselfandus.Itisstill
A、Theyusedrugsjustforfun.B、Theytakedrugstogethigh.C、Theyusedrugsasmedicine.D、Theykeepdruguseasecret.B
A、Fromthewantedcolumn.B、Fromsomeofherfriends.C、Fromatelephonedirectory.D、Fromatelevisioncommercial.B
A、Tobaccosmokinggivesthemmoreenergy.B、Peoplecan’tresistthetemptationoftobaccoads.C、Manypeopledon’trealizetheh
LivingwithParentsorNot?Forthispart,youareallowed30minutestowriteashortessayentitledLivingwithParentsor
A、Ittakespicturesonly.B、Itcannotdopaperwork.C、Itneedssomeonetoissuefines.D、Ittakespicturesanddoespaperwork.
A、Itisahousefullofcleverly-designeddevice.B、Itcanhelppeopleliveamucheasierlife.C、Itisthemostcomfortablehou
Weallknowthatemotionsoriginateinthebrain.Butweusuallytalkaboutouremotionscomingfromourhearts.Ifsomeoneyou
Forthispart,youareallowed30minutestowriteanessayontheadvantagesanddisadvantagesofnewenergyvehicles.Youshou
随机试题
(84)Oneofthebest-knownproverbsmustbe"Earlytobed,earlytorise,makesamanhealthy,wealthyandwise."Thepromisesof
受遗赠人()。
破伤风病人的面部表情特点是
根据水利部《水利建设质量工作考核办法》(水建管[2014]1351号),建设项目质量事故应急处置主要考核内容不包括()。
会计从业资格报名的基本条件有()。
会员制期货交易所应召开临时会员大会的情形包括()。
不同证券的投资组合可以降低风险,组合中证券的种类越多,其风险分散化效应就越强,可以达到全部证券的投资组合风险为零。()
吴老师在调整座位时让考试成绩好的学生优先挑选喜欢的座位。吴老师的做法()。
社会主义市场经济体制的基础是()。
如未成年人甲父母双亡,祖父母去世。外祖父母年老体衰,甲又无兄弟姐妹,可担任他的监护人包括()。
最新回复
(
0
)