"Wonderful Cloning" PPT

Description

"Wonderful Cloning" PPT

Part One: Class·Introduction

Tan Jiazhen (1909.9-2008.11), academician of the Chinese Academy of Sciences, geneticist and educator. He has been engaged in teaching and researching genetics for more than 70 years. He has taught general biology, vertebrate comparative anatomy, embryology, genetics, cytology, experimental evolution, cytogenetics, Darwinism, radiation genetics, protozoology, etc. course. Research work mainly involves cytogenetics, population genetics, radiation genetics, toxicological genetics, molecular genetics and genetic engineering of ladybirds, fruit flies, macaques, humans, plants, etc. Adhering to scientific truth, he devoted his whole life to the cause of genetics; trained a large number of outstanding talents for genetics research; established China's first genetics major, founded the first genetics research institute, and established the first life sciences institute. Academy of Sciences.

Tan Jiazhen has published more than one hundred research papers and academic essays, mainly collected in "Selected Papers of Tan Jiazhen" (1987, Science Press) and "Selected Papers of Tan Jiazhen" (1992, Zhejiang Science and Technology Press) middle.

At 7:18 on November 1, 2008, Mr. Tan Jiazhen died of illness in Shanghai Huadong Hospital at the age of 99.

Wonderful cloning PPT, the second part of the content: characters·words·sounds

1. Read

reproduction toad crawling

Gonad secretion blastoembryo stage

On the verge of hatching trypsin

pouch: (náng) a pocket containing things

Clone: ​​(kè lóng) A group of genetically identical cells or individuals formed by asexual reproduction from a common precursor.

Reproduce: (fán yǎn) to gradually increase or expand.

Embryo: (pēi tāi) Generally speaking, eggs within 2 weeks after fertilization are called pregnant eggs or fertilized eggs; 3 to 8 weeks after fertilization are called embryos

Toad: (chán chú) an amphibian with many bumps on its body and venom glands inside, commonly known as a toad.

Scale: (lín piàn) generally refers to the scaly structure growing on the surface of an organism.

Spine: (jǐ zhuī), also known as the spine and backbone, is composed of special-shaped vertebrae and intervertebral discs. It is located in the middle of the back, connected to the skull at the top, connected to the ribs in the middle, and the lower end and hip bones form the pelvis.

Amphibious: (liǎng qī) Juveniles can only live in water, not on land. Adults can live in water or on land, breathing with lungs and assisted breathing with skin

xiāng ān wú shì: live in harmony with each other without any conflicts.

Wonderful cloning PPT, the third part: overall perception

Looking at the full text, what are the characteristics of the structural arrangement of this article? What order of explanation is reflected?

Use four subtitles to divide the full text into four parts, and explain it from four angles to make the article clear and organized.

1. What is cloning (the meaning of cloning)

2. Before and after the birth of cloned crucian carp (exploration of cloning)

3. The cloned sheep “Dolly” (the development of cloning)

4. Cloning technology benefits mankind (application of cloning)

Wonderful cloning PPT, part 4 content: new lesson·explanation

What is cloning: trace the origin of the word "clone" and introduce what "clone" is

Before and after the birth of the cloned crucian carp: "Telling about the birth of the cloned crucian carp" and a brief explanation of the cloning experiment

The cloned sheep "Dolly": Detailed description of the birth of the cloned sheep "Dolly", revealing the great significance and huge repercussions of the success of cloning the sheep

Cloning technology benefits mankind: Explanation of cloning technology benefiting mankind and thoughts on cloning

Please use the language in the text to summarize "What is cloning"?

To put it simply initially: cloning is asexual reproduction;

To this day: Any group of individuals derived from an ancestor through asexual reproduction is also called a clone.

Living things that reproduce by dividing themselves in two or expanding a small part of themselves are called asexual reproduction.

Read the text carefully and explore the content of the text

Read the text to yourself and think about the following questions:

1. In order to explain "what is cloning", what explanation methods does the author use?

2. Does the section "before and after the birth of cloned crucian carp" explain the "cloning experiment" in chronological order? What are the benefits of this arrangement?

3. Why did the birth of cloned sheep cause a sensation around the world?

4. What benefits does cloning technology bring to humans?

Wonderful cloning PPT, Part 5: Questions and Exploration

Study language and learn scientific spirit

Cloning technology is developing, which is inseparable from the efforts of scientific and technical personnel. Where in the article best reflects their efforts? What spirit was shown? .

1. "Use cells at the blastocyst stage of crucian carp for artificial culture. After 385 days and 59 generations of continuous subculture, use a glass tube with a diameter of about 10 microns to suck out the nuclei from the cultured cells under a microscope."

2. “Among the 189 re-nucleated egg cells, only two hatched into fry, and in the end only one young fish survived the difficulty and grew into an 8 cm long crucian carp after more than 80 days of culture.”

3. “…relying on sophisticated surgical procedures to remove nuclei from intestinal epithelial cells, liver cells, and kidney cells of Xenopus tadpoles, and precisely placing the nuclei of these cells into egg cells whose nuclei have been damaged by ultraviolet rays.”

The rigorous, realistic and persevering attitude and spirit of scientists

What is the author's view on human cloning reflected in the text? How do you understand it?

“The discussion of ‘human cloning’ is a reminder that technological progress is a sad and happy march.”

This sentence vividly illustrates the duality of the impact of scientific and technological progress on human beings. It has not only brought great progress to society, but also caused ethical, moral and legal issues, making it difficult for humans to control. This sentence reminds us that everything is dialectical. We must divide it into two parts and treat it with a dialectical perspective and thinking. Only in this way can human beings avoid going into misunderstandings.

Wonderful cloning PPT, part six: writing method·guidance

This article is very unique in its writing style and can be discussed from the following aspects.

First of all, it is reflected in the structural arrangement of the article. Four subtitles are used to divide the full article into four parts. These four parts explain cloning from different aspects, but there is a close logical connection between them.

Secondly, the article uses various explanation methods such as examples, comparisons, numbers and explanations to explain difficult scientific principles in a simple and easy-to-understand manner.

Thirdly, the article is permeated with the author's thoughts and feelings, from which students not only gain scientific knowledge, but also receive education and inspiration.

Wonderful cloning PPT, part 7: Classroom Summary

The article "Wonderful Cloning" uses four subtitles to make the content of the full text clear and organized. The article first writes about the meaning of cloning, then about cloning experiments, then about the development of cloning, and finally about the benefits of cloning to human beings and thoughts on cloning. The context of the writing is very clear, explaining the progress of the story step by step.

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"Wonderful Cloning" PPT download:

"Wonderful Cloning" PPT Download Part One: Learning Objectives 1. Clarify the structure of the text and understand the content of the article. 2. Understand the order and method of explanation used in this article. 3. Cultivate a persevering scientific attitude and a scientific spirit of truth-seeking and innovation. Get closer to the author Tan Jiazhen...

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"Wonderful Cloning" PPT courseware 9 questions to explore: 1. What is cloning? What explanation methods did the author use to explain "what is cloning?" 2. What is the order of explanation in the section "Before and after the birth of cloned crucian carp"? How did the author organize the material? 3. Text...

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Update Time: 2024-09-05

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