Unit 5 Lesson 29 课件 2023-2024学年冀教版英语九年级全册

Unit 5 Lesson 29 We will learn The new words: DNA, blueprint, general, complex, twin, copy, repeat, pattern, identify, related, grandson, granddaughter, instruction Important and difficult points: ①In general, a blueprint is a drawing that shows how to put a house together with many different parts. ②But building a living thing is far more complex than building a house. ③Except for some twins, every living thing has its own unique DNA. ④From your DNA, scientists can identify not only you, but also people who are related to you. ⑤Your DNA has billions of instructions that explain why you are the way you are. Look at the picture. What you find? The girl looks like her mother. The boy looks like his father. 3 Your DNA comes from your parents. Why do they look the same? 4 Do you and the students near you look the same? What is the same? Warming up Lead in Think about it! What do you know about DNA? 2. What can scientists do with DNA? This is the shape of DNA. Do you think it’s magic? “DNA” is short for deoxyribonucleic acid. The two girls are twins. Maybe they have the identical DNA. [identical(adj) -identify (v.)] Why? Fang Zuming looks like his father—Cheng Long. What do you know about DNA? Lead in What can scientists do with DNA? do with 处理 do with与deal with都可表示“处理”。 do with常与what连用,而deal with常与how连用。 e.g. I don’t know what they do with the problem. 我不知道他们如何处理这个问题。 Lead in While-reading Read the lesson and answer the questions: What is a blueprint? Which is more complex, building a living thing or building a house? Do some twins have the same DNA? Is it possible to change your DNA? Whose DNA is related to yours? What is a blueprint? Which is more complex, building a living thing or building a house? Do some twins have the same DNA? It’s a drawing that shows how to put a house together with many different parts. Building a living thing is far more complex than building a house. Yes, they are. 4. Is it possible to change your DNA? 5. Whose DNA is related to yours? In