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
2023-07-01
42
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] 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://tihaiku.com/zcyy/2798308.html
相关试题推荐
Nextmonth,NewYorkstudentsingradesthreethrougheightwilltakethest
Nextmonth,NewYorkstudentsingradesthreethrougheightwilltakethest
Nextmonth,NewYorkstudentsingradesthreethrougheightwilltakethest
Nextmonth,NewYorkstudentsingradesthreethrougheightwilltakethest
Throughouthistorythebasicunitofalmosteveryhumansocietyhasbeenthe
Throughouthistorythebasicunitofalmosteveryhumansocietyhasbeenthe
Throughouthistorythebasicunitofalmosteveryhumansocietyhasbeenthe
Throughouthistorythebasicunitofalmosteveryhumansocietyhasbeenthe
HenryIIIdidn’tknowmuchaboutbiology.Hewentthroughsixwivesbackin
HenryIIIdidn’tknowmuchaboutbiology.Hewentthroughsixwivesbackin
随机试题
Theautomobilesalesmangaveussome______onthelatestmodels.A、messageB、docum
Onthenightoftheplay,Albertwasalreadymade-upand【B1】______inhispolice
Aquitedifferentviewofthebeginningofhumanspeeches【S1】______isbased
IfU.S.softwarecompaniesdon’tpaymoreattentiontoquality,theycoul
YoumayhaveheardthatCoca-Colaoncecontainedaningredientcapableofspa
某建筑高度160m宾馆,标准层建筑面积为3200㎡,建筑屋顶设有直升机停机坪,则
“组织的共同愿景是所有创造性个体的共同理想”,该组织类型是A.官僚制组织 B.
下面哪种疾病中性粒细胞常不增多A.风湿热 B.溶血性贫血 C.转移癌 D.
关于法律责任免除的含义,正确的有( )。A、前提是出现法定条件 B、法律责任可
下述哪个基因被认为与类风湿关节炎的发病和发展无关A.HLA-DR4 B.HLA
最新回复
(
0
)