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
2012-12-26
54
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."
Girl sperm was preferred to boy sperm in the research most probably because______.
选项
A、girl sperm contains more genetic material
B、more mothers want to have girl babies
C、girl sperm is healthier and more active
D、girl sperm is more easily purified
答案
A
解析
事实细节题。第1段倒数第2句中的由which引导的定语从句表明选项A的叙述正确。
转载请注明原文地址:https://kaotiyun.com/show/eYw7777K
0
大学英语四级
相关试题推荐
FarewelltoAthensEveryOlympicGamesprovidesuswithdefiningmoments.Someareobvious—likeCathyFreeman’sgoldenrun
A、Internationalchildren’sprojects.B、Socialandenvironmentalprojects.C、Projectsforpeoplewithnomoney.D、Projectsinvolv
A、Gettheuniversity’sapprovalinadvance.B、FollowSusan’sadviceabouttravelingabroad.C、TakemoreFrenchcoursestoimprov
WhyDIY?ThereasonswhypeopleengageinDIYhavealwaysbeennumerousandcomplex.Forsome,DIYhasprovidedarareoppor
WhyDIY?ThereasonswhypeopleengageinDIYhavealwaysbeennumerousandcomplex.Forsome,DIYhasprovidedarareoppor
A、Toinquireaboutswitchingmajors.B、Tofindahelpingsupervisor.C、Tomakeuptheremainingcredits.D、Toapplyforamaster
Whenyouhavetomeetsomeonefromadifferentculture,beprepared.Ifyouunderstandculturaldifferences,you’llbeabetter
A、Children.B、Family.C、Parents.D、ASPCA.C细节题。说话者认为父母才是最应该对小狗负责的人.从这句话中就可以看出来;theparentsaretheoneswhoarereallyresponsibl
Onmylastvisit,aboutthreemonthsago,mydoctorhadtoldmethatasa6-foot-tall,39-year-oldman,Ishouldweigharound18
随机试题
下列选项中哪个是不能提起行政复议的行为()
饥饿会促使个体做出觅食的活动,口渴会让个体产生寻找水源的动机,这说明动机具有【】
小偏心受压构件的相对受压高度ξ应存大于_________.小于_________之间变化。
我国某技术进出口公司与美国某公司签订一份由美方向中方销售一台精密仪器的合同,其中价格条件为DEQINCO-TERMS2000。货物在按期装运后,途中遇大风浪致使船舶触礁,由于船身摇摆过于剧烈,导致该精密仪器严重损坏。经检验,修理该仪器所需费用将超过该仪器原
在工程项目准备阶段,对应于项目决策管理层的工程咨询服务是()。
物业经营管理的常规工作中,一般分配公共成本的方式是按照()面积占物业总面积的比例计算。
Apunctualpersonisinthe【C21】______ofdoingathingatthecorrecttimeandisnever【C22】______foranything.Anunpunctua
《行政处罚法》规定,未满14周岁的人违反行政法律规范的,()。
肺腑之言对于()相当于()对于艰苦
Dogswerefirstdomesticatedfromwolvesatleast17,000yearsago,butperhapsasearlyas150,000yearsagobaseduponrecent
最新回复
(
0
)