高中英语作文2100字：反对克隆的原因和赞同克隆的原因，还要有自己的观点,反对克隆的
反对克隆的原因和赞同克隆的原因，还要有自己的观点 英语作文网收集整理 论文网 lunwen5.com westhusins eperience with cloning animals leaves him upset by all this talk of human cloning. in three years of work on the missy project, using hundreds upon hundreds of dogs eggs, the a&m team has produced only a dozen or so embryos (胚胎) carrying missys dna. none have survived the transfer to a surrogate (代孕的) mother. the wastage of eggs and the many spontaneously aborted fetuses (胎) may be acceptable when youre 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, westhusins phone has been ringing with people calling in hopes of duplicating their cats and dogs, cattle and horses. a lot of people want to clone pets, especially if the price is right, says westhusin. cost is no obstacle for missys mysterious billionaire owner; hes put up $3.7 million so far to fund a&ms research.
contrary to some media reports, missy is not dead. the owner wants a twin to carry on missys fine qualities after she does die. the prototype is, by all accounts, athletic, good-natured and supersmart. missys master does not epect an eact copy of her. he knows her clone may not have her temperament. in a statement of purpose, missys owner and the a&m team say they are both looking forward to studying the ways that her clones differ from missy.
besides cloning a great dog, the project may contribute insight into the old question of nature vs. nurture. it could also lead to the cloning of special rescue dogs and many endangered animals.
however, westhusin is cautious about his work. he knows that even if he gets a dog 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 were not even close to getting it worked out in animals yet? 反对克隆的原因和赞同克隆的原因，还要有自己的观点 英语作文网收集整理 论文网 lunwen5.com
