冀教版英语九年级上册 Lesson29 DNA－The Story of You课件(共23张PPT)

(共23张PPT)
Lesson 29
DNA－The Story of You
Leading in
Yes, they do.
Do they look the same
They’re twins.
Leading in
Do you know why they are the same
Leading in
Beacuse they have the same DNA.
Leading in
Do you look like your mother or your father
Do you know the reason
Beacuse your DNA comes from your parents.
Leading in
This is the shape
of DNA.
What is DNA
Leading in
“DNA” is short for deoxyribonucleic acid. 脱氧核糖核酸 The function of DNA is to store genetic information.
遗传的
Learning aims
1. To read and understand the passage about DNA
2. To know more about DNA
3. To learn some useful words and expressions：
general, repeat, grandson, granddaughter,
instruction, in general, expect for, be related to,
billions of…
Words and
Expressions
DNA
blueprint n.
geberal adj.
complex adj.
twin n.
repeat v.
pattern n.
脱氧核糖核酸
蓝图
一般的；普遍的
复杂的
双胞胎之一
重复；复述；背诵
模式；形式
Words and
Expressions
identify v.
related adj.
grandson n.
granddaughter n.
instruction n.
确认；鉴别
有关的；相关的
孙子；外孙
孙女；外孙女
指示；说明
1. Where does your DNA come from
Your parents.
2. Is your DNA in every part of your body
Yes, it is.
Listen to the lesson and finish the exercise.
3. Generally speaking, a ________ is a drawing.
4. ______ for identical twins, each living thing has its own unique DNA.
blueprint
Except
Read the lesson and answer the questions.
1．What is a blueprint
2．Which is more complex, building a living thing or building a house
3．Do some twins have the same DNA
A blueprint is a drawing that shows how to put a house together with many different parts.
Building a living thing.
Yes, they do.
1
4．Is it possible to change your DNA
5．Whose DNA is related to yours
Yes. In the future, scientists might be able to
change our DNA.
People who are related to me. For example, my parents and grandparents.
Read the lesson and answer the questions.
1
原文呈现
When you build a house, you use a blueprint.What’s 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 to make them fit the world they live in. How tall are you What colour are your eyes What size are your feet
in general意为“一般而言,概括说来”,通常置于句首,也可以用generally speaking来表示。
different为形容词,意为“不同的”,常用于以下结构
中:be different from与……不同;be different in…
在……上不同。
比较级前可以用much, even, still, far, a bit,
a little, a lot 等词加以修饰。
原文呈现
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.
1)except for除……以外，只是，排除的不是同类，表示对主要部分的
肯定和对局部的否定。
Your article is quite good except for several spellingmistakes.
你的文章很好，只是有几处拼写错误。
2) except “除……之外”，排除后面的人或物，而且排除的内容和主语
往往是同一类。如：We went to see ourteacher yesterday except Li
Ming. 昨天除了李明以外我们都去看我们的老师了（李明没去）。
3) besides “除……之外，还有”，包括该词后面的人或物。如：
We all went to see a film besides Li Ming. 除李明以外我们也都去看电影
了（李明去了）。
health为不可数名词,意为“健康”,常构成短语in good/bad
health,意为“健康/不健康”。
【拓展】(1)healthy为形容词,意为“健康的”;unhealthy意为
“不健康的”,keep/stay healthy意为“保持健康”。
(2)healthily为副词,意为“健康地”,eat healthily意为“吃得健康”。
原文呈现
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 has billions of instructions that explain why you are the way you are. It’s one of the most amazing things on the earth!
not only …but also…不但……而且……，连接两个相同
的成分，也可连接两个分句。连接两个并列主语时，谓
语动词和临近主语保持一致；
连列两个并列分句时，not only置于句首，通常用倒装
结构，也就是说，把not only引导的分句中的助动词或
be提到主语前面。
be related to意为“和……有联系,和……有关,与……有亲戚系”
related为形容词,意为“有关的,相关的”。relate为动词,意为
“把……联系起来”,常与to或with搭配。
本句句末的you are是the way的定语从句。the way的定
语从句的引导词可用in which,或用that,也可以不用引导
词。way在本句中意为“情况,状态”。
one of the most amazing things意为“最令人惊奇的事情之一”,为“one of the+形容词的最高级+复数名词”结构。其中定冠词the也可使用形容词性的物主代词来代替。
Fill in the blanks with the phrases in the box.
1.Your homework is quite good　　　　 a few spelling mistakes.
2.　　　　 the young　　　　 the old like pop music.
3.Kate’s hair is　　　　 colour　　her sister’s.
4.　　　　 ,women live longer than men.
5.　　　　 many difficulties remain,we can overcome them.
6.Is wealth　　　　 happiness
except for
Not only but also
the same as
In general
Even if
related to
in general, except for, not only…but also, related to, even if, the same…as…
2
Complete the passage with the sentences in the box.
Changing DNA
　　Do you know DNA can be changed Have you ever seen a pig with a dog’s body Of course not! Pigs and dogs can’t have babies together.　　　　But now, scientists can do it. Scientists can take DNA from one kind of animal and put it into another kind of animal. They can design new plants by combining the DNA of other plants.　________　　　Some scientists are worried. They say we need to know more about DNA before we start changing it.　　　　But what if the plants are bad for humans, too
A.Their DNA can’t combine.
B.We can make plants that are bad for pests.
C.They can even combine the DNA of a plant and an animal.
A
C
B
3
Is it a good idea to change the DNA of the food we eat Some people say doing this makes our food better. Others think it’s too dangerous. Search the Internet for information and write down your ideas.
·Do you think it’s a good idea to change the DNA of the food we eat Why or why not
·What are some of the positives of genetically modified food
·What are some of the negatives of genetically modified food
4
Ⅰ.Fill in each blank with the proper word.
1. This is the __________(identify) hotel that we stayed in last year.
2. Your brothers are people _________(relate) to you.
3. Do you know who is the _________(own) of the house
4.Your body uses this pattern _________ (build) itself.
5. You have your own DNA, but it repeats the patterns from your __________(parent) DNA.
6. Some health problems come from your family’s DNA. _________(science) can look for these problems in your DNA.
identical
related
owner
to build
parents’
Scientists
Exercise
Ⅱ . 同义句转换
1.Both you and Linda give us a big surprise.
　　　　 　　　　you　　　　 　　　Linda_____　　　　us a big surprise.
2.It takes me half an hour to clean up my room.
I 　　　　half an hour　　　　 up my room.
3.My book isn’t the same as his.
My book is　　　　 　　　　 his.
4.What do you do with this problem
　　　　do you　　　　with this problem
5.He can speak Chinese.
He is 　　　　　　　　speak Chinese.
6.I don’t know how I could build a house.
I don’t know how　　　　 　　　　a house.
Not only but also
spend cleaning
different from
How deal
to build
able to
gives
Exercise
Homework:
1. Preview the words and expressions in Lesson30.
2. Write a passage about DNA, try to tell what it is, where it is from, what things you show your parents’ DNA
Thank you!