克隆利弊的英语作文(2)

don't you think it is embarrassing?or if this kind of human reproduction is allowed,terrorists may get hold of it and reproduce lots of "american presidents".don't you agree that these presidents might bring the world much more chaoes?besides these terrible aspects,the cloning of whole--being may destroy the diversity of people of the globe.

of course, there still remains much more disadvantages of the application of cloning reproduction of human being and animals. we should be extremely cautious of what we do and thus remember we will sure be respondible for all the results created by ourselves!!!

so how do u think about it?

increased food security for growing populations

if the low success rates can be improved (dolly was only one success out of 276 tries),reproductive cloning can be used to develop efficient ways to reliably reproduce animals with special qualities.for example,drug-producing animals or animals that have been genetically altered to serve as models for studying human disease could be mass-produced.

reproductive cloning also could be used to repopulate endangered animals or animals that are difficult to breed.in 2001,the first clone of an endangered wild animal was born,a wild ox called a gaur.the young gaur died from an infection about 48 hours after its birth.in 2001,scientists in italy reported the successful cloning of a healthy baby mouflon,an endangered wild sheep.the cloned mouflon is living at a wildlife center in sardinia.other endangered species that are potential candidates for cloning include the african bongo antelope,the sumatran tiger,and the giant panda.cloning extinct animals presents a much greater challenge to scientists because the egg and the surrogate needed to create the cloned embryo would be of a species different from the clone.

therapeutic cloning technology may some day be used in humans to produce whole organs from single cells or to produce healthy cells that can replace damaged cells in degenerative diseases such as alzheimer's or parkinson's.much work still needs to be done before therapeutic cloning can become a realistic option for the treatment of disorders.

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