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
考研
"I’ve never met a human worth cloning," says cloning expert Mark Westhusin from the cramped confines of his lab at Texas A&M Uni
"I’ve never met a human worth cloning," says cloning expert Mark Westhusin from the cramped confines of his lab at Texas A&M Uni
admin
2016-03-22
15
问题
"I’ve never met a human worth cloning," says cloning expert Mark Westhusin from the cramped confines of his lab at Texas A&M University. "It’s a stupid endeavor."【F1】
That’s an interesting choice of adjective, coming from a man who has spent millions of dollars trying to clone a 13-year-old dog named Missy.
So far, he and his team have not succeeded, though they have cloned two calves and expect to clone a cat soon. They just might succeed in cloning Missy later this year—or perhaps not for another five years. It seems the reproductive system of man’s best friend—dog is one of the mysteries of modern science.
Westhusin’s experience with cloning animals leaves him vexed by all this talk of human cloning.【F2】
In three years of work on the Missyplicity project, using hundreds upon hundreds of canine eggs, the A&M team has produced only a dozen or so embryos carrying Missy’s DNA.
【F3】
The wastage of eggs and the many spontaneously aborted fetuses may be acceptable when you’re dealing with cats or bulls, he argues, but not with humans.
"Cloning is incredibly inefficient, and also dangerous," he says.
Even so, dog cloning is a commercial opportunity, with a nice research payoff. Ever since Dolly the sheep was cloned in 1997, Westhusin’s phone at A&M College of Veterinary Medicine has been ringing busily. Cost is no obstacle for customers like Missy’s mysterious owner, who wishes to remain unknown to protect his privacy. He’s plopped down $3.7 million so far to fund the research because he wants a twin to carry on Missy’s fine qualities after she dies. But he knows her clone may not have her temperament.【F4】
In a statement of purpose, Missy’s owners and the A&M team say they are "both looking forward to studying the ways that her clone differs from Missy."
The fate of the dog samples will depend on Westhusin’s work.【F5】
He knows that even if he gets a dog viably pregnant, the offspring, should they survive, will face the problems shown at birth by other cloned animals: abnormalities like immature lungs and heart and weight problems.
"Why would you ever want to clone humans," Westhusin asks, "when we’re not even close to getting it worked out in animals yet?"
【F2】
选项
答案
在研究“克隆密斯项目”的三年时间里,农业机械大学的团队使用了成百上千只犬科动物的卵子,却仅仅获得了一打左右的带有密斯DNA的胚胎。
解析
转载请注明原文地址:https://jikaoti.com/ti/P7Z7FFFM
0
考研英语一
相关试题推荐
Withinthespanofahundredyears,intheseventeenthandearlyeighteenthcenturies,atideofemigrationoneofthegreatfol
UFOsareunidentifiedflyingobjects,butnoonereallyknowswhattheyare.Manyresearchers(called"ufologists")havetheories
UFOsareunidentifiedflyingobjects,butnoonereallyknowswhattheyare.Manyresearchers(called"ufologists")havetheories
Newscientificstudiesrevealthehiddencostsofmultitaskingastechnologyincreasinglytemptspeopletodomorethanonethin
[A]Whateverfragileharmonywemayhavebeenabletoachievewithinourselvesisexposedeverydaytodangerouschallengesandt
Familiarasitmayseem,gravityremainsamysterytomodernphysics.Despiteseveraldecadesoftrying,scientistshavefailed
Judgingfromrecentsurveys,mostexpertsinsleepbehavioragreethatthereisvirtuallyanepidemicofsleepinessinthenatio
Judgingfromrecentsurveys,mostexpertsinsleepbehavioragreethatthereisvirtuallyanepidemicofsleepinessinthenatio
随机试题
公安机关在侦查案件的过程中,对犯罪嫌疑人的存款、汇款:
一般说,知识的理解性与过去经验无关。
以下哪个药物具有中枢作用和抗胆碱作用
开放式基金合同生效后,可以在规定的期限内只接受申购,不办理赎回,但最长不得超过( )个月。
申购新股型理财计划属于()。
东方朔画赞碑存于德州陵县文博苑内,为我国唐代大书法家()的盛年代表之作,历代名家评价很高。
车灯或路灯一般为(),这是因为它()。
某乡进行人大代表的选举。某村作为一个选区,应选乡人大代表3人。因实行差额选举,代表候选人最多为6人。该村选民李某等15人拟联合提出代表候选人。他们可以提出的候选人数目是()。
Whatisthepassagemainlyabout?
Startingafamilysosoonwoulddefinitely______hercareerprospectsforher.
最新回复
(
0
)