英语多媒体课件：冀教版九年级下Unit 2 DNA Lesson 10（共16张PPT）

Lesson 10 What Is DNA? Look at their skins, eyes, heights, hairs. Are they different from each other? Why? Do you and the students near you look the same? What is the same? Are there differences between you and them? Lead in: “DNA” is short for deoxyribonucleic acid. DNA is a pattern for your body to build itself. (like a blueprint) Presentation: T T T F F Listen to the tape and answer “ T” or “F” 1.DNA is the pattern our body uses to build itself. 2.Our bones do not have the same DNA as our skin. 3.From your DNA , scientists can identify you and people related to you. 4.Each living thing has its own, unique DNA. 5.All health problems come from our family’s DNA. Identical twins are two children that grew from the same egg. They have identical DNA. They’re clones! The two girls are twins. Maybe they have the identical DNA. [identical（adj.) -----identify (v.)] Why? Fang Zuming looks like his father—Jackie Chan. 1.Are there differences between you and them? 你和他们之间有什么不同吗? 【辨析】bet