According to Deborah Barnes in “Research in the News: Creating a Cloned Sheep Named Dolly” (2003), the writer states that, “in biology, a clone is a cell or an organism that is genetically identical to another cell or organism”. In her article, She explains the process of creating clone is, when scientists decide to clone an animal, they take the nucleus of a cell and place it into an egg cell. The egg cell then divides to produce an embryo that develops into an animal. However, she describes the cloned sheep Dolly, the first mammal to have been successfully cloned, was different and remarkable because of she was generated from a specialized adult cell, not from an unspecialized embryonic cell.
After Dolly, more and more other animals have been cloned, the writer mentions that, cloning is now considered a promising tool for preserving endangered species from being extinct. Also, she thinks that extinct species may be “brought back to life”. However, she suggests that the cloning of an extinct species has not yet been attempted, due to technological limitations, though bioethical and philosophical objections have also been raised.
Furthermore, in her article, she states that many biologists and environmentalists oppose cloning endangered species — not because they think it won't work but because they think “it may deter donations to help preserve natural habitat and wild animal populations”.
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2 comments:
It's very interesting!I know the clone sheep Dolly, and I'm really interested in how clone works. Is clone animal normal as real animals?Do they have some weakness or difficulties? I'm curious. And then, I agree with the reason why many environmentalists against the produce clone for extinct aniumals,because people willl loose idea of protecting life and the importance of life.
Clone is a very efficient way to protect the endangered species; and it also could be a likely way that revive the extinct animals. However, comparing with these, I am more interested in human clone. It concerns a lot of issues, especially the ethic. Most of our group members can not accept it. I don't think we can have opportunity to see it, but I believe it will become true one day in future.
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