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
25
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
ArtificialIntelligence(AI)A)Weoftendon’tnoticeit,butartificialintelligence(AT)isallaroundus.Itispresentinco
InonlytwodecadesAsianAmericanshavebecomethefastest-growingU.S.minority.Astheirchildrenbeganmovingupthroughthe
Divorcedoesn’tnecessarilymakeadultshappy.Buttoughingitoutinanunhappymarriageuntilitturnsaroundjustmightdo,a
Peoplewholiveinheavilyindustrializedareasdonotgetasmuchsunlightastheyshould.Dust【C1】______overacityataltitud
SomeyearsagoIwasofferedawritingassignmentthatwouldrequirethreemonthsoftravelthroughEurope.Ihadbeenabroada
Didyouknowthatallhumanbeingshavea"comfortzone"regulatingthedistancetheystandfromsomeonewhentheytalk?Thisdi
Didyouknowthatallhumanbeingshavea"comfortzone"regulatingthedistancetheystandfromsomeonewhentheytalk?Thisdi
A、Shewasfoundstealinginabookstore.B、Shecaughtsomeoneintheactofstealing.C、Sheadmittedhavingstolensomething.D、
随机试题
下列诗句不是出自唐朝诗人的是()。
肩胛骨骨折好发于
长寿县灯具厂于2008年4月向商标局申请为其产品注册“长寿”商标。4月10日,商标局审查后认为“长寿”系县级以上行政区划名称而驳回申请。4月14日,灯具厂收到驳回通知。某邻县灯泡厂一直使用未注册的“长寿”商标。请问:如果复审结果改变初审决定,予以初步审
Pickouttheappropriateexpressionsfromtheeightchoicesbelowandcompletethefollowingdialoguesbyblackeningthecorresp
下丘脑上界为__________,下界为__________,__________和__________,前界为__________和__________,漏斗的中央称__________,漏斗的下端与__________相连。
A.琥珀酸B.丙酮酸C.苹果酸D.草酸乙酸E.旷酮戊二酸接受氨基可直接转化为谷氨酸的是
下列浙江省古寺庙建筑,其主要特点是进深大于面阔,呈纵长方形,在同时代的佛殿建筑中极为罕见的是()。
以下数据结构中,不属于线性数据结构的是()。
下列选项中划线字的读音有误的一项是()。
下面数据结构中,属于非线性的是()
最新回复
(
0
)