单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Unit 5 Look into science,Lesson 29 DNAThe Story of You,Think about it!,What do you know about DNA?,What can scientists do with DNA?,Words,DNA,blueprint,general,complex,twin,repeat,脱氧核糖核酸,n.,蓝图,adj.,一般的；普遍的,adj.,复杂的,n.,双胞胎之一；孪生儿之一,v.,重复；复述；背诵,n.,模式；形式,v.,确认；鉴别,adj.,有关的；相关的,n.,孙子；外孙,n.,孙女；外孙女,n.,指示；说明,pattern,identify,related,grandson,granddaughter,instruction,Words,1.To learn about the knowledge of DNA.,2.To learn the secret of the formation of people.,3.To learn some useful words and,expressions.,Objectives,What do you know about DNA?,Every one has different DNA.,But twins have the same DNA.,Twins look like each other.,What can scientists do with DNA?,科学家利用,DNA,绘制犯罪分子,“,基因大头照,”,未来变异动物狂想曲,This is the shape of DNA.,Do you think its magic?,DNA(,Deoxyribonucleic acid,),，中文译名为,“,脱 氧核糖核酸,”,，是染色体的主要化学成分，同时 也是基因组成的材料，有时被称为,“,遗传微粒,”,。,DNA,是种分子，可组成遗传指令，构成个 简单生命至少需要,265,到,350,个基因，以引导生 物发育与生命机能运作。主要功能是长期性的资 讯储存，可比喻为,“,蓝图,”,或,“,食谱,”,。其中包 含的指令，是建构细胞内其他的化合物，如蛋白 质与,RNA,所需。带有遗传讯息的,DNA,片段称 为基因，其他的,DNA,序列，有些直接以自身构 造发挥作用，有些则参与调控遗传讯息的表现。,When you build a house,you use a blueprint.,Whats a blueprint?,In general,a blueprint is a drawing that shows how to put a house together with many different parts.DNA is the blueprint of life.,But building a living thing is,far,more complex than building a house.It takes millions of years for nature to change the DNA in living things to make them fit the world they live in.,How tall are you?What colour are your eyes?What size are your feet?All these things are strongly influenced by your DNA before you are born!,DNA is fantastic!,Except for,some twins,every living thing,has its own unique DNA.,Some health problems can be caused by,problems in your DNA.,Scientists can look for these problems and,sometimes,help you before you become sick.,In the future,scientists might be able to,change your DNA.,There are copies of your DNA in every,part of your body.For example,your finger,has the same DNA as your hair.,You have your own unique DNA,but it,repeats patterns from your parents DNA.,From your DNA,scientists can identify not,only you,but also people who are,related to,you.Your parents and grandparents are,related to you,and you have their DNA.,When you have a,grandson or,granddaughter,he or,she will have your,DNA.,Your DNA comes from your parents.,Your DNA has billions of instructions that explain why you are the way you are.Its one of the most amazing things on the earth!,Read the lesson and answer the questions.,Lets Do It!,1,1.What is a blueprint?,A blueprint is a drawing that shows how to,put a house together with/using many,different parts.,2.Which is more complex,building a living,thing or building a house?,Building a living thing is far more complex,than building a house.,3.Do some twins have the same DNA?,Yes,some twins have the same DNA.,4.Is it possible to change your DNA?,Yes,it is.In the future,scientists might,be able to change our DNA.,5.Whose DNA is related to yours?,The people who are related to you.For,example,your parents and grandparents.,Language points,In general,a blueprint is a drawing that,shows how to put a house together with many different parts.,一,般而言，蓝图就是一幅图纸，它显示一 座房子的构造。,in general,意思是“一般而言；概括说来,（,通常置 于句首,）”。,也可以用,generally speaking,来表示。例如：,In general/Generally speaking,women cry,more easily than men.,一般而言，女人比男人容易哭。,2.But building a living thing is,far,more,complex than building a house.,但创造个,生物比盖房子要复杂得多。,far,用来修饰形容词和副词的比较级，这样的,词语还有,much,still,even,no,a little,a bit,a lot,rather,any,等。例如：,The room is,a bit,larger than that one.,这个房间比那个稍大一点。,He works,still,harder than ever.,他比以往更加努力学习了。,Matters are,a lot,better than ever before.,情况,远远,比以往好。,Can he jump,any,higher?,他能跳得更高些吗？,Lesson One is,much,easier than Lesson Two.,第一课比第二课容易得多。,Tom looks,even,younger than before.,汤姆看上去甚至比以前还年轻。,This train runs,much,faster than that one.,这辆火车比那辆快得多。,3.,Except for,some twins,every living thing,has its own unique DNA.,除了同卵双胞胎,之外，每个生 物都有自己独特的,DNA,。,except for,意思是“除,之外；要不是由,于,，,它要求排除的是不同类的。例如：,The city is good,except,the weather.,除天气外，这 座城市还不错。,Except for,one old lady,the bus was empty.,除一位老太太乘坐外，公共汽车空无一人。,She would have left her husband years ago,except for,the children.,要不是为了孩子，她几年前就离开她的丈夫了。,except,意思是“除,之外”，它要求排除的是 同类。另外，,except,一,般不用于句首,。,We all went to the zoo,except,Li Ming.,除了李明以外，我们都去了动物园。,I did nothing,except,watching TV yesterday.,昨天，我除了看电视以外，什么也没干。,He also knows Japanese,besides,English.,除了情英 语之外,他也懂日语。,（两门外语他都懂）,Two other boys are on duty today,besides,you.,包括你在内还有两名男孩今天值日。,（共三人）,besides,意思是“除,.,之外,(,尚有,)”,，,包括,besides,之后的内容。例如：,4.From your DNA,scientists can identify not,only you,but also people who are,related to,you.,从你的,DNA,中，科学家们不但能够辨,认出你，而且能 够辨认出和你有血缘关系,的人。,relate,与,to/with,连用，表不“与,有关”或“使,互相关联”。例如：,He is,related to,my family.,他与我的家庭有关系。,The matter,relates to,him.,这事与他有关。,I cant,relate,what he does,with,what he says.,我无法把他的言行联系起来。,5.Your DNA has billions of instructions that,explain why you are the way,you are,.,你的,DNA,中有数 万个指令，来解释