(共18张PPT)
Unit 5
Look into Science
Lesson 29
DNA－The Story of You
Free Talk
Beacuse your DNA comes from your parents.
Do you know the reason
Does Cindy look like her mother or her father
Do you look like your mother or your father
Look at the picture!
The two girls look the same.
They are twins.
Free Talk
Beacuse they have the same DNA.
Do you know why they are the same
What is DNA
Free Talk
“DNA” is short for deoxyribonucleic acid.
脱氧核糖核酸 [di:' ksi,raib unju:'kli:ik]
The function of DNA is to store genetic information.
genetic 遗传的
This is the shape of DNA.
Lead in
How tall are you
What colour are your eyes
What size are your feet
Do you think it’s magic
All these things are strongly influenced by your DNA before you are born!
Let's learn a new lesson and find out how fantastic DNA is!
Listen and follow
New Words
If you want to make a car, you should know a_________ idea of how a car works.
general
general adj. 一般的;普遍的
in general = generally speaking 意思是“一般而言; 通常”
In general, women cry more easily than men.
New Words
This is ping-pong world champion Liu Guoliang.
The others are _______ to him, they are his wife and two daughters.
related
be related to “与......相关”
The matter is related to him.
New Words
They are ____________ for public places.
instructions
instruction n. 指示;说明
Fill in the blanks with the phrases in the box.
in general except for not only…but also
related to even if the same…as
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
Even if
related to
the same
In general
except for
Not only
but also
as
Exercises
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.
Reading tasks
Read the lesson and answer the questions.
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.
Reading tasks
6．What are fantastic facts about DNA
Reading tasks
Except for some twins, every living thing has its own unique DNA.
Some health problems can be caused by problems in your DNA.
There are copies of your DNA in every part of your body.
You have your own unique DNA, but it repeats patterns from your parents’ DNA.
He is a good man except for a bad temper.
他是个好人,除了有点脾气坏 。
We all went to the zoo except Li Ming.
除了李明以外,我们都去了动物园。
Nobody was there but him in the room.
除他之外, 大家都不在。
He also knows Japanese besides English.
除了懂英语之外,他也懂日语。
Language Points
temper 性情；脾气，（ 只是主语的一个细节）。
Li Ming 被排除在外。
多用在no,nobody,who,where,all等词之后 。
除了英语之外还有日语。
[辨析] 各种各样的“除外”
except 意为 “除了”, 表示从整体中除去,不包括所除事物在内,除去的和非除去的是同类事物。一般不用于句首。
except for 意为 “除了”, 说明整个基本情况后,对细节加以纠正,其后一般接名词或名词性短语。
besides 意为 “除了……之外还有”,包括所 “除” 的事物在内。
but 意为 “除……外”, 多用在no,nobody,who,where,all等词之后。
Language Points
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
C
B
A
Reading tasks
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.
Divide the students into two groups.
One group support it is a good idea to change the DNA of the food we eat.
The other group say something about the disadvantages of changing the DNA of the food.
Group Work
DNA blueprint twin general repeat complex pattern identify related grandson granddaughter instruction
But building a living thing is far more complex than building a house.
Except for some twins,every living thing has its own unique DNA.
From your DNA，scientists can identify not only you，but also people who are related to you.
Summary
