Knowledge objectives:(1) to make Ss grasp the usage of words, expressions and sentence structures: statistics, struggle, thanks to, rid of, some patterns for persuasion, the “ing” form as subject and object;(2)to use learnt knowledge to persuade sb.Ability objectives:(1) to develop Ss’ reading skills(skimming, scanning, word guessing);(2) to improve Ss’ speaking, communicating and cooperating skills.Emotional objectives:to make Ss know the contribution of Yuan,and learn his spirit and his simple life time.Teaching important and difficult points:(1) some words, expressions and sentence structures mentioned above;(2)the content of the text;(3)training their reading and speaking skills.Teaching methods: CLT, TBLT,QT.Learning strategies: CLS, QLS, TBLS.Teaching procedures:Step 1 lead-in: (1) teacher plays a piece of recent news from CCTV about the harvest of the super hybrid rice, and ask students whether they know Yuan or not, and talk about him and his contribution.(2)Brain storm: let Ss describe Yuan in their minds including his appearance, his living condition and so on.Step 2 fast reading tasks:(1)teacher introduces Yuan and super hybrid rice(2)make Ss read the text as fast as possible with questions. Such as: what’s the general ideaof this passage? What’s Yuan’ dream? (skimming and scanning skill)Step 3 intensive reading tasks(1)let Ss read the text silently, find topic sentence of each paragraph and draw the difficult sentences and the knowledge what they don’t understand.(words guessing)(2)teacher and Ss talk about the important words, expressions and sentences together, and ask Ss to retell the content of the text.(summarizing and paraphrasing)(3)teacher summarize this part.(4) read again following the courseware.
在接下來的細(xì)讀環(huán)節(jié),我套用了高考對閱讀理解的考查方式設(shè)置了5個問題,分別為三個推理判斷題,一個細(xì)節(jié)題和一個主旨大意題。學(xué)生需要對文章的內(nèi)容進(jìn)行分析、歸納、推理、猜測等高級思維活動才能做出正確的回答?!驹O(shè)計意圖】這一過程是對學(xué)生進(jìn)行細(xì)讀的訓(xùn)練,培養(yǎng)學(xué)生獲取特定信息和挖掘文章深層次信息的能力。第三環(huán)節(jié):Intensive-reading (精讀) 15′第三個環(huán)節(jié)精讀,既是最重要的環(huán)節(jié),也是突破本課重難點的關(guān)鍵。首先,讓學(xué)生思考劇本中人物看到百萬英鎊前后的態(tài)度發(fā)生了怎樣的變化。其次,讓學(xué)生仔細(xì)閱讀文章,找出可以表現(xiàn)人物態(tài)度變化的具體的語言和動作。最后,讓學(xué)生總結(jié)人物的態(tài)度發(fā)生變化的根本原因是什么,從而引出Money Talks, 供學(xué)生思考?!驹O(shè)計意圖】通過一系列的活動培養(yǎng)學(xué)生學(xué)習(xí)從人物的語言和動作探究人物的心理,使學(xué)生進(jìn)一步體會戲劇語言的魅力,從而對文章背后所反映的社會問題進(jìn)行思考,也為下一步的討論環(huán)節(jié)做好鋪墊。
In this class, I have 3 teaching aims, that is, knowledge aims, ability aims and emotion aims.1) Knowledge-Teach students new words and expressions, such as temporary, bleed,sprain choke, first aid, fall ill and so on.-Enable students to have a better understanding for some basic knowledge of first aid.2) Ability-Train students’ speaking, reading and writing abilities by different teaching activities, such as skimming, comprehending, team work, role play, retelling and writing.-Develop students’ reading strategy on how to move general idea to specific information.3) Emotion-Promote students’ awareness of giving first aid.- Cultivate students’ creativities.Then let’s come to my teaching methods and activities.III. Teaching methods and activities:To achieve different teaching aims, various kinds of teaching methods and activities will be adopted throughout this period, such as TBL (task-based learning), skimming, team work, brainstorm and others, which can offer students opportunities to fulfill tasks in which they can use language to achieve a specific outcome.IV. Teaching aids:Computer and blackboardV. Teaching important points:1) Make students have a clear mind for the structure of the text.2) Help students understand the theme of the text.VI. Teaching difficulties:1) So many new words may affect students’ understanding.2) How to get students to know about the functions of the skin and thecauses, characteristics and treatments for different degree burns,and the knowledge about giving first aid. VII. Blackboard design:
今天我們來介紹一下必修五第四單元的授課方式。這個單元的題目是Making the news。應(yīng)該是學(xué)生比較感興趣的話題,學(xué)生往往對新聞工作充滿好奇,所以我們可以利用這個機(jī)會多設(shè)計一些師生互動和學(xué)生互動,來激發(fā)起學(xué)習(xí)的積極性,提高學(xué)習(xí)效率。同時我們可以利用這個單元不僅幫助學(xué)生掌握語言知識,培養(yǎng)語言能力,同時讓其了解新聞工作的重要性,培養(yǎng)起社會智能感。這個單元分為六個課時,它的教學(xué)目標(biāo)是這樣的:語言目標(biāo)是掌握詞匯表中的常用單詞和短語,掌握倒裝句的一些基本用法。 技能目標(biāo)是能初步掌握約會的基本句型并在真實的場景下正確運用。新聞報道類文章的寫作技能。采訪的基本規(guī)范和溝通技能。情感目標(biāo)是對新聞報道的客觀性和真實性有更好的理解。對新聞記者的職業(yè)有更深入的了解,并能體會其工作的重要性。下面我們來介紹一下第一課時的授課方式,第一課的教學(xué)目標(biāo)是這樣的第一課時的教學(xué)目標(biāo)語言目標(biāo):單詞:Occupation, journalist, editor, photographer, curious, personality, enthusiasm
Teaching Aims:Knowledge 1. Get the students to learn the useful new words and expressions in this section. Aims:2. Let the students learn about how the UK was formed and the four groups of invaders.1. Develop students’ reading ability and let them learn different Ability reading skills. Aims:2. Enable students to learn to talk about the United Kingdom and the Union Jack Emotional 1. Let students know more about the UK2. Develop students’ sense of cooperative learning Aims:Teaching Important Points:1. Let the students learn about the countries of the United Kingdom and the Union Jack2. Get the students to read the passage and know about how the UK was formed and the four groups of invaders.3. Have the students learn different reading skills.Teaching Difficult Ponts:1. Develop students’ reading ability.2. Enable students to talk about the United Kingdom and the Union Jack.3. Let students learn how the UK was formed geographically and historically.Teaching Methods:Showing pictures, asking, exercising, listening, reading etc.Teaching Aids:A computer,a projector and a blackboard.Teaching Procedures: 1) Show a map of the world, ask students the following questions:Where is the UK?What’s the full name of the UK?2) Ask the students work in pairs to do the quiz on Page 9.Do you want to test how many things you know about the United Kingdom? Let’s have a small test.Using the map on P9, students answer the following questions:?How many countries does the UK consist of? What are they??England is divided into three main areas. Do you know what they are? 1) Scanning (10Minutes )Let the students hold the questions asked in pre-reading and read the passagequickly and then let them do the following exercise.Join lines to the right answer.
分析過焦作市的地理概況和產(chǎn)業(yè)優(yōu)勢后,就需要針對由于資源枯竭所帶來的問題提出合理化的建議。既然是談經(jīng)濟(jì)轉(zhuǎn)型,就應(yīng)該將話題的范圍明確在這一領(lǐng)域內(nèi)。通過材料3的相關(guān)內(nèi)容,我們了解到焦作市需要在產(chǎn)業(yè)結(jié)構(gòu)調(diào)整、培育新的優(yōu)勢產(chǎn)業(yè)、增強(qiáng)綜合競爭力等三個整改方針上下功夫。因而引導(dǎo)學(xué)生針對優(yōu)勢與不足提出建議,以三個整改方針為基準(zhǔn),衡量建議的可行性是鍛煉學(xué)生解決此類問題的有效途徑。在此我將教會學(xué)生的是解決問題方法而非案例的內(nèi)容,正所謂“授之以魚,不如授之以漁”。接下來針對學(xué)生的建議和教材資料分析所羅列的10點整改思路,由學(xué)生自由發(fā)言提出看法,通過教師的指導(dǎo)和學(xué)生的討論,進(jìn)而確定經(jīng)濟(jì)轉(zhuǎn)型建議的具體方案。最后注意將建議與產(chǎn)業(yè)優(yōu)勢相對照,看建議是否都是圍繞著產(chǎn)業(yè)優(yōu)勢而提出的,這樣做會加深學(xué)生的印象,通過建議和優(yōu)勢的對應(yīng)關(guān)系,將不難找出此類問題的解題思路。
4、學(xué)習(xí)全詞:(1)背景介紹,讓學(xué)生看課文中的年代,然后讓學(xué)生回憶1925年的毛澤東的情況,老師適當(dāng)提示,讓學(xué)生了解其背景。(出示幻燈片)(2)學(xué)生自由朗讀,結(jié)合注釋和背景理解詩詞。(3)師生共同理解全詞①先讓學(xué)生齊讀前三句,思考正確的語序,并用正常的語序解釋。②品味第三到第十句,這里是教學(xué)的一個重點,要讓學(xué)生先讀,再理解,在此基礎(chǔ)上訓(xùn)練學(xué)生的想象能力。③分析上闕中的最后三句。④小結(jié)上闕。提出了一個問題“誰主沉浮”讓學(xué)生在文中找內(nèi)容回答,然后轉(zhuǎn)入下闕內(nèi)容的分析。⑤分析下闕內(nèi)容,回答“誰主沉浮”的問題,突出本文主旨5、描繪詩詞形象:學(xué)生用自己的語言把上闕的內(nèi)容生動地描繪出來。6、欣賞學(xué)生優(yōu)秀作品。(根據(jù)時間具體而定,也可以作為課后作業(yè))
4、本文的重點是說辭,雖僅百余字,卻委婉曲折,步步進(jìn)逼,層層深入,表現(xiàn)出高超的勸說藝術(shù)、游說技巧。讓學(xué)生細(xì)細(xì)品味并概括說辭中包含幾層意思。第一層(“秦、晉圍鄭,鄭既知亡矣”),分析形勢,以退為進(jìn),博得好感。第二層(“若亡鄭而有益于君”至“君之薄也”),亡鄭陪鄰,動搖聯(lián)盟。第三層(“若舍鄭以為東道主”至“君亦無所害”),存鄭有益,利益引誘。第四層(“且君嘗為晉君賜矣”至“唯君圖之”),追溯歷史,深入離間。可見燭之武面對大國的君主,巧舌如簧,不卑不亢,從容辭令,既不刺激對方也不失本國尊嚴(yán),語言的分寸掌握得恰到好處。表現(xiàn)出燭之武機(jī)智善辯的外交才能。5、面對風(fēng)云突變的局勢,晉侯沒有感情用事,而表現(xiàn)了清醒的頭腦和理智的判斷。這種隱忍不發(fā)、隨機(jī)應(yīng)變的胸懷和謀略,正是晉文公終成霸業(yè)的根本原因。設(shè)計意圖:本環(huán)節(jié)的重點是全面把握燭之武這一人物性格特征,以及退秦師過程中體現(xiàn)出的非凡的膽識以及高超的謀略和語言藝術(shù)。
生2:頷聯(lián)的意思是只聽到禁衛(wèi)軍中傳來夜間巡邏的梆子聲,不再向?qū)m中那樣安逸地聽到有雞人打鳴報時的聲音了。生3:頸聯(lián)的意思是說事變發(fā)生那天軍隊發(fā)生嘩變停留不前,但當(dāng)年唐玄宗以為自己可以和貴妃天天在一起,對天上的牽牛和織女一年一度的會見還加以嘲笑呢。生4:尾聯(lián)的含義是為什么唐玄宗當(dāng)了四十五年的皇帝,還不如普通百姓夫妻恩愛,長相廝守。師:好的。請大家再齊讀一遍詩文,做到人人都能疏通詩的含義。學(xué)生再次齊讀。第三環(huán)節(jié):專項探究師:白居易曾說:“文章合為時而著,歌詩合為事而作。”這首詩就是作者途經(jīng)馬嵬驛,詠馬嵬之變這一歷史事件而作,所以我們鑒賞的第三步,就是通過標(biāo)題和詩文,弄清詩中的歷史事件。請同學(xué)們找出詩中哪些詩句描述了這一事件?
本文篇幅較長,并且有一字句不易理解,因而對高一學(xué)生來說完全讀懂內(nèi)容有一些困難。這樣的話,老師就要做好引導(dǎo)工作,把一些難點,或是出現(xiàn)詞類活用比較多,局勢比較特殊的句子,老師可以先給學(xué)生畫出來,存疑,或是與同學(xué)們一起討論解決。對那些不易懂的字詞就引導(dǎo)學(xué)生聯(lián)系上下文提供的語境、前后涉及的情節(jié)加以推測、判斷,以培養(yǎng)學(xué)生依據(jù)文脈推斷詞義的好方法。要求學(xué)生點出重點實詞、框出通假字,主要是為幫助學(xué)生積累和掌握一些文言文中常見的一詞多義、異讀現(xiàn)象、古今異義和通假現(xiàn)象的詞語,并進(jìn)一步得出規(guī)律,指導(dǎo)今后的文言文學(xué)習(xí)。詞類活用和特殊句式在文言文翻譯中難度較大,也是本文教學(xué)的兩大難點。要求學(xué)生標(biāo)出有活用現(xiàn)象的字和劃出句式特殊的句子,是基于兩點考慮:1、積累一定數(shù)量的第一手例句;2、引導(dǎo)學(xué)生加以分類,找出每類的相同特征,并抽取出來形成規(guī)律性的東西,從而上升到理性認(rèn)識,使學(xué)生能由學(xué)會一個到會學(xué)多個。翻譯過程中注重指導(dǎo)學(xué)生養(yǎng)成用符號法表示重點字句的好習(xí)慣,如點、框、圈、劃線等符號應(yīng)約定一致,便于突出翻譯中的重點、難點及復(fù)習(xí)。我的提示著重歸納了實詞“制”“亡”“遺”“利”等,名詞活用、形容詞活用、使動用法,被動句、狀語后置句。
說教材A.教材簡析《琵琶行(并序)》是人教版《普通高中課程標(biāo)準(zhǔn)實驗教科書語文》必修3第二單元的一篇講讀課文。本單元學(xué)習(xí)的是唐代詩歌,共七首詩?!杜眯校ú⑿颍肥翘拼F(xiàn)實主義詩人白居易寫的一首歌行體長篇敘事詩,是我國古代敘事詩和音樂詩中的“千古絕喝”。詩歌主題鮮明、人物形象生動,抒情真切細(xì)膩,具有深刻的思想內(nèi)容和卓越的藝術(shù)技巧。B.教學(xué)目標(biāo)《全日制普通高中高級中學(xué)語文教學(xué)大綱》明確要求我們:在閱讀教學(xué)過程中要引導(dǎo)學(xué)生“感受文學(xué)形象,品味文學(xué)作品的語言和藝術(shù)技巧,初步鑒賞文學(xué)作品”。而本單元的教學(xué)要求是培養(yǎng)學(xué)生詩歌鑒賞的能力。根據(jù)教學(xué)大綱和單元教學(xué)要求,結(jié)合本課特點,我制定本課的教學(xué)目標(biāo)是:1.知識目標(biāo):了解文學(xué)常識;積累重點文言實詞;品味主旨句“同是天涯淪落人,相逢何必曾相識”的內(nèi)涵;感知作者把音樂描寫與聽者、演奏者的感情融為一體的寫作特點。
Good morning, distinguished judges:It’s my honor to talk about my teaching ideas with you. Today my topic is Women of Achievement. My presentation consists of six parts: the analysis of teaching material and student, teaching aims, key and difficult points, teaching and studying method, teaching procedures and blackboard design.First, let’s focus on the analysis of teaching material. This lesson is from New Senior English for China Student’s Book 4 Unit 1, the reading part. The main topic of the passage is the introduction of a student of Africanwildlife. After this lesson, the students will learn more information about her studying chimps in Africa, and their reading and speaking abilities can be developed as well.The next part is the analysis of students. My students are in senior high students. They have learnt English for many years, they’ve known many words and sentences, but their speaking and reading abilities are still not very good. So I will practice their speaking and reading abilities through different exercises.According to the New Standard Curriculum and the present situation, I set the teaching aims as follows: firstly, knowledge aims. Students can grasp some new words, such as worthwhile, move off. Moreover, students can understand the content of the passage and get familiar with the topic of studying chimps in wildlife. Secondly, ability aims. Students can use reading strategies such as skimming and scanning in reading process. Thirdly, emotional aims. Students can have the awareness of protecting animals and care about animals.Based on the above analysis, the key point of this lesson is to get the main idea and the detailed information from the passage; the difficult point is to talk about the wildlife protection and use reading strategies.
通過寫文章梗概,培養(yǎng)學(xué)生綜合運用語言的能力,學(xué)習(xí)用恰當(dāng)?shù)挠⒄Z描述科學(xué)家的故事。這是本課的教學(xué)難點。教師可以使用完形填空的方式來幫助學(xué)生整理語篇,從而來降低難度。本課的教學(xué)重點的突破方法是:在閱讀前,讓學(xué)生初步了解得出科學(xué)觀點所需要的基本程序,從而輕松而自然地導(dǎo)入文章的閱讀;在閱讀過程中,由易到難設(shè)計快速閱讀和精讀的問題,層層推進(jìn)各種閱讀活動,讓學(xué)生對閱讀內(nèi)容從整體感知到細(xì)節(jié)理解,最后深層讀懂整篇文章,同時加強(qiáng)閱讀策略的指導(dǎo),讓每個學(xué)生都主動參與課堂教學(xué)活動,最終達(dá)到提高閱讀能力的目的。Step 4 Post-readingGroup Activities四人小組共同合作,在老師的適當(dāng)指導(dǎo)下,就以下2個問題展開討論,讓學(xué)生就所知、所學(xué)、所感和所想融入話題,然后抽若干同學(xué)代表作小組發(fā)言。1. What do you think about John Snow, and what should we learn from him?2. Cholera was 19th century disease, which two diseases are similar to cholera today? Why?
Good afternoon, everyone. It’s my great pleasure to be here sharing my lesson with you. The content of my lesson is Senior English for China Book5 Unit 3 Life in the Future. I’ll be ready to begin this lesson from six parts: Analysis of the teaching material, Analysis of the students, Teaching aims and important and difficult points, Teaching methods and aids, Teaching procedures, and Blackboard design. First, let me talk about the teaching material.Part 1 Analysis of the Teaching Material:This unit is about what human beings’ life will be like in about one thousand years. By studying of this unit, we’ll Enable the students to know the changes in humans’ life and some new inventions bringing about the change and develop the interest in science. This lesson plays an important part in the English teaching in this unit. This is an important lesson in Book Five. From this lesson, it starts asking the Ss to grasp contents of each passage. Therefore, this lesson is in the important position of the teaching material. If the Ss can learn it well, it will be helpful to make the Ss learn the rest of this unit.Part 2 Analysis of the SsAs Senior2 Ss, they are at different levels of English fluency, some of them have lost interest in English. So during the lesson, I arrange a variety of activities to let all of them join in to attract their interest and let them be confident and taste the joy of success.
(三)說目標(biāo)鑒于以上學(xué)情分析,結(jié)合單元學(xué)習(xí)任務(wù)群——思辨性閱讀與表達(dá)的定位,確定本課教學(xué)目標(biāo)為通過設(shè)置任務(wù)情境,帶領(lǐng)學(xué)生在活動中認(rèn)識表達(dá)的有針對性、論述的層次邏輯性以及感受文章蘊(yùn)含的批判力量。其中以表達(dá)的有針對性為教學(xué)重點,以論述的層次邏輯性為難點。(四)說理念根據(jù)課標(biāo)和教材特點,結(jié)合學(xué)情,授課將依托“學(xué)為中學(xué)理論”“建構(gòu)主義學(xué)習(xí)理論”和“最近發(fā)展區(qū)理論”等,積極開展閱讀與鑒賞、表達(dá)與交流、梳理與探究等語文實踐活動提升學(xué)生語文核心素養(yǎng)。三、教學(xué)實施(一)設(shè)定學(xué)習(xí)情境為引導(dǎo)廣大學(xué)生合理對待外來文化,學(xué)校辯論社擬設(shè)定辯題——如何正確對待外來文化展開辯論。有同學(xué)說堅決抵制外來文化(正方),也有同學(xué)說要積極吸收(反方)……那么如果你是其中一位辯手,你將在《拿來主義》中如何擷取素材呢?
1、外匯與外幣的關(guān)系:(1)外匯包括外幣,但外匯不等于就是外幣。外幣是指外國的貨幣,包括外國的紙幣、鑄幣;外匯通常是以外國貨幣表示的用于國際間結(jié)算的支付手段,具體包括外幣、外幣有價證券、外幣支付憑證等。(2)外幣屬于外匯的范圍,但不能把二者等同起來。通常情況下,只有可以自由兌換的外幣才是外匯,因為外匯的實質(zhì)是國際支付手段,如果某種貨幣不能自由兌換,它就不能成為國際支付手段。外匯執(zhí)行的 主要是貨幣的支付手段的職能。(3)持有外匯意味著對外匯發(fā)行國擁有債權(quán)。持有外匯過多,一方面意味著國際支付能力強(qiáng)和有可能對外匯發(fā)行國施加影響;另一方面則意味著大量該由本國享受的資源,被借給外國利用,并要承擔(dān)外匯貶值的風(fēng)險。2、關(guān)于幣值變化的分析:(1)對貨幣升值的具體分析:一個國家的貨幣升值(上?。┖?,同量的這種貨幣能比以前換 取更多的他國貨幣,買到更多的他國商品。
一、人類遺傳病1.概念2.分類(1)單基因遺傳病(2)多基因遺傳病(3)染色體異常遺傳?、僭颌陬愋?遺傳病的特點4.遺傳病對人類的危害八、說布置作業(yè)在作業(yè)的布置中,我嚴(yán)格遵循“重質(zhì)量、輕負(fù)擔(dān)”的指導(dǎo)思想。第一題主要是為了幫助學(xué)生及時糾正原有的對知識的錯誤理解或片面認(rèn)識,培養(yǎng)學(xué)生的解題技巧和技能。所以我選用了該題。同時想借助該題培養(yǎng)學(xué)生對問題的科學(xué)的思維方法和探究的精神。幫助學(xué)生提高對信息技術(shù)運用的熟練程度,發(fā)展學(xué)生的信息素養(yǎng)。附作業(yè):1、連線題,請同學(xué)們連線指出下列遺傳各屬于何種類型?(1)苯丙酮尿病 A、單基因遺傳?。?)21三體綜合征(3)抗維生素D佝僂病 B、多基因遺傳?。?)軟骨發(fā)育不全(5)青少年型糖尿病 C、常染色體病2、以生物小組為單位進(jìn)行人類遺傳病的調(diào)查。
(二)組織學(xué)生探究知識并形成新的知識。我從學(xué)生的生活體驗入手,運用案例等形式創(chuàng)設(shè)情境呈現(xiàn)問題,使學(xué)生在自主探索、合作交流的過程中,發(fā)現(xiàn)問題、分析問題、解決問題,在問題的分析與解決中主動構(gòu)建知識。主要通過幾幅漫畫讓學(xué)生思考其中的哲學(xué)道理,開始接觸哲學(xué)。漫畫一:種瓜得瓜,種豆得豆,種雞蛋得??漫畫二:甲:下雨好極啦!乙:下雨糟透了!漫畫三:——狂妄之徒,你竟然壞了祖上規(guī)矩!在引導(dǎo)學(xué)生思考、體驗問題的過程中,可以使學(xué)生逐步學(xué)會分析、解決問題的方法。這樣做既有利于發(fā)展學(xué)生的理解、分析、概括、想象等創(chuàng)新思維能力,又有利于學(xué)生表達(dá)、動手、協(xié)作等實踐能力的提高,促進(jìn)學(xué)生全面發(fā)展,力求實現(xiàn)教學(xué)過程與教學(xué)結(jié)果并重,知識與能力并重的目標(biāo)。
f.有絲分裂的意義(討論分析教學(xué)),首先引導(dǎo)學(xué)生結(jié)合所學(xué)知識討論有絲分裂的的作用,最后有教師歸納總結(jié),并要求學(xué)生在理解的基礎(chǔ)上記憶。g.無絲分裂(圖形直觀教學(xué)、簡介),本部分內(nèi)容不是教學(xué)的重點,內(nèi)容也相對簡單,所以我的教學(xué)方法是直接給學(xué)生展示掛圖,再進(jìn)行簡短介紹,讓學(xué)生了解即可。h.引出減數(shù)分裂的概念,為第五章學(xué)習(xí)打下基礎(chǔ)。小結(jié):新課講完以后由教師對本節(jié)內(nèi)容進(jìn)行總結(jié)鞏固和反饋:進(jìn)行一些課堂練習(xí)達(dá)到鞏固和反饋的作用。最后布置作業(yè),各種難度的作業(yè)題目均設(shè)置一些,其中簡單題比重大,難題要求學(xué)生選作,這樣提高學(xué)生學(xué)習(xí)積極性。2教學(xué)媒體程序設(shè)計: 細(xì)胞周期的概念(多媒體課件演示周期動畫)植物細(xì)胞有絲分裂(多媒體課件演示分裂各期動畫)動植物細(xì)胞有絲分裂異同點(多媒體課件演示分裂各期動畫)有絲分裂過程中DNA和染色體數(shù)量的變化規(guī)律(掛圖演示,包括表格和函數(shù)圖象)
(1觀察圖解,色盲基因在性別間是如何傳遞的呢?(女--女、女--男、男--女)(2)為什么不能由男性傳給男性?(色盲基因是在X染色體上,因此色盲基因是隨X染色體的傳遞而傳遞。)(3)男性的色盲基因怎樣才能傳給男性呢?(通過女兒,傳給外孫即交叉遺傳)(4)從圖解看色盲在男女中的發(fā)病情況怎樣?(男性多于女性)(5)從社會調(diào)查也是這樣,你是否能從基因和染色體的角度加以解釋?(提示:女性染色體的構(gòu)成,結(jié)合基因位置及顯隱性進(jìn)行分析)歸納特點:歸納出色盲基因遺傳的特點并擴(kuò)展到X染色體隱性遺傳的特點上。色盲基因遺傳(X隱性遺傳)的特點:(1)男患者多于女患者(2)交叉遺傳(3)女病兒子必病,男正女兒必正等。問題探討:利用“遺傳圖解”結(jié)合“問題鏈”繼續(xù)探討,拓展到抗維生素D即X 染色體顯性遺傳的特點。(6)色盲基因在X染色體上屬隱性基因,子代表現(xiàn)男多于女,對應(yīng)的正常色覺基因則屬于X顯性基因,子代表現(xiàn)應(yīng)如何?(女多于男)