英语作文关于克隆的相关句子和单词？
如果说格雷的第一张人体解剖图解开了人体结构之迷,奠定了近代医学的基础,但同时也给人类带来很大的困惑.
女娲造人时,上天便赐于我们眼睛.有一天人们用它第一次在水中惊喜地看见了自己的倒影,而后人们通过镜子看自己,直到现在,人们又通过基因这一特殊的镜子,以一种全新的形式审视自己,由此审视世界.
我们欣喜地看到了基因研究利用的广阔前景.随着转基技术的运用,水仙的基因已被植入水稻,使之含铁量明显的增高;随着人们对基因的了解,克隆技术应运而生;第一只克隆羊多利活生生地站在了人们面前;随着克隆技术的发展,人类的器官可以被克隆,有望用新器官接替我们已老损的器官.......如此种种让人类似乎已可充当第二个上帝,或者说第二个女娲了.有人说上帝总是一手拿着答案,一手拿着问号.
克隆是英语单词clone的音译,clone源于希腊文klon,原意是细苗或嫩枝以无性繁殖或者营养繁殖的方式培育植物,随着时间的推移,克隆的内涵已经扩大了,只要是由1个细胞获得2个以上的细胞,细胞群或生物体,由一个亲本序列产生的DNA的序列,就是克隆.
克隆就如一把双刃剑.
每当春暖花开的时候,喜欢弄草的人便会做植物扦插;一种外观像苹果而味道似梨的水果—苹果梨,就是采用果树嫁接法培养而成的,扦插和嫁接实质上也是克隆.也是对人类的好处.克隆人体器官对医学发展也有很大促进作用,更是对身患癌症或残疾人的一个福音.
克隆人与亲本间的辈分关系,克隆人该是作为父辈,子辈或同一辈分或者是其它,这与我们平常所遵循的长幼有分起了矛盾,也会混乱各种社会人际关系.
克隆人是对人的不种不尊重表现.克隆人,就不只是件复制品.倘若人可以随意克隆,那就是就每个人都拥有无数次生命.此时再讲生命的价值已毫无意义了.这是否也意味着生命可以任意践踏,人格可以任意伤害 这又与我们平时所强调的尊重每个人的生命.生命只有一次又从何谈起 一个人,如果连对自已生命的自主权都没有,那他的生存意义何在
克隆人会给野心家和不法分子有利可乘.我们不能不考虑到有可能克隆人将引发一声战争.野心家利用克隆人征服全球,这似乎在科幻小说中才能见到.但现实生活中并不是完全不可能.而利用克隆人作案,危害人身安全更是可想而知.
我们应该理智地看待克隆,将它变为对人类有利的科学技术而非人类走向灭亡的武器
追问：
“克隆就如一把双刃剑” .....“将它变为对人类有利的科学技术而非人类走向灭亡的武器 ”
.后能再有一些议论么 ， 我想构造进作文中 ..
回答：
克隆本是有功，而无罪，有罪的是人们的心。人们应利用克隆去造福人类，而不应当利用克隆毁灭人类！
Today’s technology develops so quickly that many impossible things become true; the cloning technology is the example. What is cloning? Cloning is a process used to create an exact copy of a mammal by using the complete genetic material of a regular body cell. Different from the common propagate, cloning need only one cell and without sex. In 1997, the great news shocked the whole world that the British scientists created a lamp named Dolly from a single cell, miraculously; the cell had been taken from the udder of adult sheep, which show the first cloning experiment was successful.
When the cloning technology improves so quickly, many scientists and doctors have different opinions, someone think it is good but someone think it is bad. Cloning can bring many benefits to the human, such as rejuvenation, helpful for Defective genes, Liver failure, Kidney failure and Leukemia. These disease are very different to cure, if we use the cloning technology we can change the Gene’s DNA order, so we can save lots of people.
But cloning still has some problems. The scientists found that the cloning animal’s Gene has a little different from the original animal. So the life will shorter than the real life. The fact proved that, the cloning sheep Dolly has died. It only has the half life of the common sheep.
In my own opinion I agree to clone the endangered animal and disagree with cloning human. Because I think the cloning technology should be respected. It really can bring us many benefits; further more it can develop the science of human. If clone the human, there will, however, be many problems, the population is the biggest problem. May be some people will use the cloning people to start the war. So I am against cloning human.
Also many countries disagree to clone people. The government makes the laws about cloning. There are laws against human cloning in Canada, Denmark, England, Norway, Spain, and the UK. Even in the USA, the government doesn’t allow to clone human. (Because in USA, the human right is higher than everything)
In the end, I think cloning is new technology, it should be accepted, how to look upon this technique, first we should know the advantages and disadvantages, then we should know the effect of cloning for human and the animal, third we will take the action: To advocate the animal cloning but be against with the human cloning.
Molecular cloning refers to the process of making multiple copies of a defined DNA sequence. Cloning is frequently used to amplify DNA fragments containing whole genes, but it can also be used to amplify any DNA sequence such as promoters, non-coding sequences and randomly fragmented DNA. It is used in a wide array of biological experiments and practical applications ranging from genetic fingerprinting to large scale protein production. Occasionally, the term cloning is misleadingly used to refer to the identification of the chromosomal location of a gene associated with a particular phenotype of interest, such as in positional cloning. In practice, localization of the gene to a chromosome or genomic region does not necessarily enable one to isolate or amplify the relevant genomic sequence.
In practice, in order to amplify any DNA sequence in a living organism, that sequence must be linked to an origin of replication, which is a sequence of DNA capable of directing the propagation of itself and any linked sequence. However, a number of other features are needed and a variety of specialised cloning vectors (small piece of DNA into which a foreign DNA fragment can be inserted) exist that allow protein expression, tagging, single stranded RNA and DNA production and a host of other manipulations.
Cloning of any DNA fragment essentially involves four steps [1]
fragmentation - breaking apart a strand of DNA
ligation - gluing together pieces of DNA in a desired sequence
transfection - inserting the newly formed pieces of DNA into cells
screening/selection - selecting out the cells that were successfully transfected with the new DNA
Although these steps are invariable among cloning procedures a number of alternative routes can be selected, these are summarized as a cloning strategy’.
Initially, the DNA of interest needs to be isolated to provide a DNA segment of suitable size. Subsequently, a ligation procedure is used where the amplified fragment is inserted into a vector (piece of DNA). The vector (which is frequently circular) is linearised using restriction enzymes, and incubated with the fragment of interest under appropriate conditions with an enzyme called DNA ligase. Following ligation the vector with the insert of interest is transfected into cells. A number of alternative techniques are available, such as chemical sensitivation of cells, electroporation and biolistics. Finally, the transfected cells are cultured. As the aforementioned procedures are of particularly low efficiency, there is a need to identify the cells that have been successfully transfected with the vector construct containing the desired insertion sequence in the required orientation. Modern cloning vectors include selectable antibiotic resistance markers, which allow only cells in which the vector has been transfected, to grow. Additionally, the cloning vectors may contain colour selection markers which provide blue/white screening (α-factor complementation) on X-gal medium. Nevertheless, these selection steps do not absolutely guarantee that the DNA insert is present in the cells obtained. Further investigation of the resulting colonies is required to confirm that cloning was successful. This may be accomplished by means of PCR, restriction fragment analysis and/or DNA sequencing.
Cloning a cell means to derive a population of cells from a single cell. In the case of unicellular organisms such as bacteria and yeast, this process is remarkably simple and essentially only requires the inoculation of the appropriate medium. However, in the case of cell cultures from multi-cellular organisms, cell cloning is an arduous task as these cells will not readily grow in standard media.
A useful tissue culture technique used to clone distinct lineages of cell lines involves the use of cloning rings (cylinders)[2]. According to this technique, a single-cell suspension of cells which have been exposed to a mutagenic agent or drug used to drive selection is plated at high dilution to create isolated colonies; each arising from a single and potentially clonally distinct cell. At an early growth stage when colonies consist of only a few of cells, sterile polystyrene rings (cloning rings), which have been dipped in grease are placed over an individual colony and a small amount of trypsin is added. Cloned cells are collected from inside the ring and transferred to a new vessel for further growth.
Cloning in stem cell research
Main article: Somatic cell nuclear transfer
Somatic cell nuclear transfer can also be used to create a clonal embryo. The most likely purpose for this is to produce embryos for use in research, particularly stem cell research. This process is also called "research cloning" or "therapeutic cloning." The goal is not to create cloned human beings, but rather to harvest stem cells that can be used to study human development and to potentially treat disease. While a clonal human blastocyst has been created, stem cell lines are yet to be isolated from a clonal source.[3]
Horticultural
The term clone is used in horticulture to mean all descendants of a single plant, produced by vegetative reproduction or apomixis. Many horticultural plant cultivars are clones, having been derived from a single individual, multiplied by some process other than sexual reproduction. As an example, some European cultivars of grapes represent clones that have been propagated for over two millennia. Other examples are potato and banana. Grafting can be regarded as cloning, since all the shoots and branches coming from the graft are genetically a clone of a single individual, but this particular kind of cloning has not come under ethical scrutiny and is generally treated as an entirely different kind of operation.
Many trees, shrubs, vines, ferns and other herbaceous perennials form clonal colonies. Parts of a large clonal colony often become detached from the parent, termed fragmentation, to form separate individuals. Some plants also form seeds asexually, termed apomixis, e.g. dandelion.
Parthenogenesis
Clonal derivation exists in nature in some animal species and is referred to as parthenogenesis (reproduction of an organism by itself without a mate). An example is the "Little Fire Ant" (Wasmannia auropunctata), which is native to Central and South America but has spread throughout many tropical environments.
Reproductive cloning
Reproductive cloning uses "somatic cell nuclear transfer" (SCNT) to create animals that are genetically identical. This process entails the transfer of a nucleus from a donor adult cell (somatic cell) to an egg which has no nucleus. If the egg begins to divide normally it is transferred into the uterus of the surrogate mother.
Such clones are not strictly identical since the somatic cells may contain mutations in their nuclear DNA. Additionally, the mitochondria in the cytoplasm also contains DNA and during SCNT this DNA is wholly from the donor egg, thus the mitochondrial genome is not the same as that of the nucleus donor cell from which it was produced. This may have important implications for cross-species nuclear transfer in which nuclear-mitochondrial incompatibilities may lead to death.
Dolly the Sheep
Main article: Dolly the Sheep
Dolly (1996-07-05 – 2003-02-14), a Finn Dorsett ewe, was the first mammal to have been successfully cloned from an adult cell, though the first actual thing to be cloned, was a tadpole in 1952[1]. She was cloned at the Roslin Institute in Scotland and lived there until her death when she was six. On 2003-04-09 her stuffed remains were placed at Edinburgh's Royal Museum, part of the National Museums of Scotland.
Dolly was publicly significant because the effort showed that the genetic material from a specific adult cell, programmed to express only a distinct subset of its genes, could be reprogrammed to grow an entire new organism. Before this demonstration, there was no proof for the widely spread hypothesis that differentiated animal cells can give rise to entire new organisms.
Cloning Dolly the sheep had a low success rate per fertilized egg; she was born after 277 eggs were used to create 29 embryos, which only produced three lambs at birth, only one of which lived. Seventy calves have been created from 9,000 attempts and one third of them died young; Prometea took 328 attempts. Notably, although the first clones were frogs, no adult cloned frog has yet been produced from a somatic adult nucleus donor cell.
There were early claims that Dolly the Sheep had pathologies resembling accelerated aging. Scientists speculated that Dolly's death in 2003 was related to the shortening of telomeres, DNA-protein complexes that protect the end of linear chromosomes. However, other researchers, including Ian Wilmut who led the team that successfully cloned Dolly, argue that Dolly's early death due to respiratory infection was unrelated to deficiencies with the cloning process.
Species cloned
Further information: List of animals that have been cloned
The modern cloning techniques involving nuclear transfer have been successfully performed on several species. Landmark experiments[clarify] in chronological order:
Tadpole: (1952) Many scientists questioned whether cloning had actually occurred and unpublished experiments by other labs were not able to reproduce the reported results.[citation needed]
Carp: (1963) In China, embryologist Tong Dizhou cloned a fish. He published the findings in a Chinese science journal which was never translated into English.[4]
Mice: (1986) was the first successfully cloned mammal; Soviet scientists Chaylakhyan, Veprencev, Sviridova, Nikitin had mice "Masha" cloned. Research was published in the magazine "Biofizika" volume ХХХII, issue 5 of 1987.[clarify][5]
Sheep: (1996) From early embryonic cells by Steen Willadsen. Megan and Morag[citation needed] cloned from differentiated embryonic cells in June 1995 and Dolly the sheep from a somatic cell in 1997.[6]
Human: (November 1998) hybrid embryo created from leg cells and a cleaned cow egg - not allowed to implant in a womb, nor develop, nor be born due to ethical issues.[citation needed]
Rhesus Monkey: Tetra (female, January 2000) from embryo splitting[7][clarify]
Gaur: (2001) was the first endangered species cloned.[8]
Cattle: Alpha and Beta (males, 2001) and (2005) Brazil[9]
Cat: CopyCat "CC" (female, late 2001), Little Nicky, 2004, was the first cat cloned for commercial reasons[citation needed]
Mule: Idaho Gem, a john mule born 4 May 2003, was the first horse-family clone.[citation needed]
Horse: Prometea, a Haflinger female born 28 May 2003, was the first horse clone.[citation needed]
Human cloning
Main article: Human cloning
Human cloning is the creation of a genetically identical copy of an existing or previously existing human. The term is generally used to refer to artificial human cloning; human clones in the form of identical twins are commonplace, with their cloning occurring during the natural process of reproduction. There are two commonly discussed types of human cloning: therapeutic cloning and reproductive cloning. Therapeutic cloning involves cloning cells from an adult for use in medicine and is an active area of research: while reproductive cloning would involve making cloned human beings. Such reproductive cloning has not been performed and is illegal in many countries. A third type of cloning called replacement cloning is a theoretical possibility, and would be a combination of therapeutic and reproductive cloning. Replacement cloning would entail the replacement of an extensively damaged, failed, or failing body through cloning followed by whole or partial brain transplant.
The various forms of human cloning are controversial.[10] There have been numerous demands for all progress in the human cloning field to be halted. Some people and groups oppose therapeutic cloning, but most scientific, governmental and religious organizations oppose reproductive cloning. The American Association for the Advancement of Science (AAAS) and other scientific organizations have made public statements suggesting that human reproductive cloning be banned until safety issues are resolved [11]. Serious ethical concerns have been raised by the idea that it might be possible in the future to harvest organs from clones. Some people have considered the idea of growing organs separately from a human organism - in doing this, a new organ supply could be established without the moral implications of harvesting them from humans. Research is also being done on the idea of growing organs that are biologically acceptable to the human body inside of other organisms, such as pigs or cows, then transplanting them to humans, a form of xenotransplantation.
The first human hybrid human clone was created in November 1998, by American Cell Technologies.[12]. It was created from a man's leg cell, and a cow's egg whose DNA was removed. It was destroyed after 12 days. Since a normal embryo implants at 14 days, Dr Robert Lanza, ACT's director of tissue engineering, told the Daily Mail newspaper that the embryo could not be seen as a person before 14 days. While making an embryo, which may have resulted in complete human had it been allowed to come to term, according to ACT: "[ACT's] aim was 'therapeutic cloning' not 'reproductive cloning'"
On January, 2008, Wood and Andrew French, Stemagen's chief scientific officer in California, announced that they successfully created the first 5 mature human embryos using DNA from adult skin cells, aiming to provide a source of viable embryonic stem cells. Dr. Samuel Wood and a colleague donated skin cells, and DNA from those cells was transferred to human eggs. It is not clear if the embryos produced would have been capable of further development, but Dr. Wood stated that if that were possible, using the technology for reproductive cloning would be both unethical and illegal. The 5 cloned embryos, created in Stemagen Corporation lab, in La Jolla, were destroyed.[13]
http://www.cloneguide.com/
克隆 cloning
克隆人 cloned human being
克隆人这种技术 technology of cloning
克隆技术 cloning technology
克隆人军队 cloned-men army
摘抄了一篇，不知是否满意
反对克隆的原因和赞同克隆的原因，还要有自己的观点
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?
帮我写篇以“克隆的前景”为话题的作文
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5、哎，刚开始大快人心，现在我却被这些克隆人搞得晕头转向，闷闷不乐。我该怎样甩掉她们呢，糟了，我还没学会还原技术呢。不过我想，不久的将来我一定会学会的。6、克隆技术有好有坏，如果克隆人的话，世界上的人将会越来越多，地球可要遭殃喽。所以我们应当克隆一些对社会有用的东西，比如克隆...
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巴穆消栓： 克隆 cloning 克隆人 cloned human being 克隆人这种技术 technology of cloning 克隆技术 cloning technology 克隆人军队 cloned-men army
兖州市17540858815： 求助关于克隆英语作文克隆一个东西 你喜欢的 还有理由 .100词作业 - ？
巴穆消栓：[答案] 假如我会克隆,我要克隆一个感觉交换器.让老师、父母、同学都知道我的内心世界. 我先进入电脑网络,来到快乐星球,向老顽童爷爷借上感觉交换器,放进克隆机里,五分钟后,一个新的感觉交换器诞生了. 快考试了,老师和家长都心急如焚,为我...
兖州市17540858815： 求一篇关于“克隆”的英语10句文!急用! - ？
巴穆消栓：[答案] Cloning in biology is the process of producing populations of genetically-identical individuals that occurs in nature when ...software.Human cloning is the creation of a genetically identical copy of an existing or previously existing human.The term is ...
兖州市17540858815： 求一篇有关克隆的英语作文有关克隆的好处的..简单点就行...100字左右的..谢啦.. - ？
巴穆消栓：[答案] Society 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 way...
兖州市17540858815： 关于克隆的英语作文(很急) - ？
巴穆消栓： 如果说格雷的第一张人体解剖图解开了人体结构之迷,奠定了近代医学的基础,但同时也给人类带来很大的困惑. 女娲造人时,上天便赐于我们眼睛.有一天人们用它第一次在水中惊喜地看见了自己的倒影,而后人们通过镜子看自己,直到现在,...
兖州市17540858815： 求一篇有关克隆的英语作文 - ？
巴穆消栓： Society 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 ...
兖州市17540858815： 求:关于克隆的英语作文!!!只能用五个句子表达全部内容!!!还要表达自己的观点!!!(各位大虾们快 - ？
巴穆消栓： For reason: can through cloning to cure; Cloning can help not the child's parents with children! The reason: cloning against animal sick easily early death; Scientists have cloned by mistake and the possibility of monsters!!!!!
兖州市17540858815： 求助 写一篇关于克隆的英语作文 - ？
巴穆消栓： Firstly, I want to explain what is clone. In the dictionary, clone is a group of plants or organisms produced asexually from one ancestor. It can replicate the gene from the best biology. So it brings us its usages. I think clone technology can help man to ...
兖州市17540858815： 写一篇有关克隆的英语作文 - ？
巴穆消栓： You can read the word ＂cloning＂ quite often in the newspaper. I find it very interesting. It seems like a fairy story.With cloning you will be copied. Today, scientists can clone some large animals. Doctors are in the process of cloning humans though...
兖州市17540858815： 关于克隆人的英语作文要求是:作文分三段,第一段说克隆人的好处,第二段说克隆人的坏处,最后一段发表自己的看法.不能有语法问题.字数不要太多啊. - ？
巴穆消栓：[答案] Did you ever imagine having a child that is the exact replica of you?Did you ever imagine of having the cure for heart disease ... “right” thing to do or not.This controversy is currently going on right now and will be even a greater controversy if the ...
