2022年英语专八写作：克隆

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　　Westhusin's experience 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 dog's eggs, the A&M team has produced only a dozen

　　or so embryos (胚胎) carrying Missy's 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 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 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 Missy's mysterious

　　billionaire owner; he's put up $3.7 million so far to fund A&M's

　　research.

　　Contrary to some media reports, Missy is not dead. The owner wants a twin

　　to carry on Missy's fine qualities after she does die. The prototype is, by all

　　accounts, athletic, good-natured and supersmart. Missy's master does not expect

　　an exact copy of her. He knows her clone may not have her temperament. In a

　　statement of purpose, Missy's 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 we're not even close to getting it worked out in animals yet?

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