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Step2.Lead in : Look at the pictures,then watch a video about DNA.
Step3.Review the words and practice.
Step4.Listening: Ask the Ss to listen to the tape, then answer the questions: What is DNA? How is DNA?
Step5: Reading : Read 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?
(4).Is it possible to change your DNA?
(5). Whose DNA is related to yours?
Step 5. Careful-reading part2:
Why is DNA fantastic?
Step6: Language points:
Watch a video about language points
Step7: It’s time to practice.
Step8:Free talk: Is it a good idea to change the DNA of the food we eat?
Step9: Summary: We all know. Your DNA comes from your parents. 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.
Step10: Homework
1.Write the composition down in your book.
2.Finish Let’s do it3.
3. Read the text three time at least.
Blackboard-writing:
Lesson29:DNA-The Story of You
is a blueprint of life. in general
DNA
1.unique. except for
2.healthy
Changeable. be able to
is fantastic.3.same. the same…as
4.related. be related to
Billions of…