关于克隆的英语ppt.ppt

 “克隆” is the transliteration of clone, scientists call the operation which reproduces the animals of artificial heredity as clone and this biological technology is called clone technology. Cloning is the most attractive story of the new biotechnologies(生物技术) and the one which causes the most heated discussion over its worth. Here are answers to the most common questions about cloning. What is cloning? Cloning is the creation of cells or whole animals using DNA from a single parent, bypassing the normal reproductive process. The clone has the same DNA to the parent. The generalized clone refers to every crowd from a same ancestor, passing through asexual propagation How are clones created? The most common process takes DNA from one cell and puts in a hollowed-out(挖空的；掏空的) egg. Chemicals and electricity are then used to encourage the new DNA to fuse with(与…合并) the egg and develop into an embryo(胎儿). This technique is called nuclear transfer(核迁移). cloned animals ??????????????????????????????????????? Dolly is created！ 1997年2月22日，英国“Nature”刊登了爱丁堡罗斯林研究所维尔穆特的研究成果，即“多莉”羊的克隆成功，从此震惊了世界。 name：DOLLY sex：female species：Mammalia, bovine, ovine birth：July 5, 1996 hometown：Scotland DNAfather：No DNAmother：A white sheep from Finland mitochondrion-mother：A black-sheep from Scotland birthgiving-mother：Another black-sheep from Scotland time of entering the friends-society：February 23, 1997 children：Fertility 6, survived 5 death：February 14, 2003 Why was Dolly(世界上的第一只克隆羊) important? The sheep was the first mammal(哺乳动物) to be cloned using DNA taken from an adult cell. Previously(以前), animals had only been cloned using embryo cells which already have the potential(潜力) to become a complete embryo in its own right(继承父母的). The big breakthrough with Dolly was to make a clone from an ordinary, adult cell - in this case from a female goats udder(乳房). The development of clone Microbial cloning period Genetic engineering cloning period Cloning period on an individual level D