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    初三一模復習易錯題匯總——生物(一)

    2019-02-19 13:48:21  來源:本站原創

    初三一模復習易錯題匯總——生物(一)!在中考生物一模考試中,基礎知識的模塊是一定要拿分的。今天我給各位同學挑選了《2018年初三一模、中考考試真題》中的基礎知識考察題型,同學們可以查缺補漏,鞏固復習。以下便是今日的學習內容,供大家一模復習使用。下面是小編為大家帶來初三一模復習易錯題匯總——生物(一)。(點擊附件免費下載完整版)

     

     

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      初三一模復習易錯題匯總——生物(一)


      愛智康教學部 徐夢萱老師整理


      在中考生物一模考試中,基礎知識的模塊是一定要拿分的。今天我給各位同學挑選了《2018年初三一模、中考考試真題》中的基礎知識考察題型,同學們可以查缺補漏,鞏固復習。以下便是今日的學習內容,供大家一模復習使用。


      例題1:


      隨著研究的深入,關于人類的性別決定、第二性征的差異等問題,正逐步被揭示。請回答下列問題。


      


      (1)圖1是一個正常人的體細胞染色體排序圖,由圖可知,此人性別為 。


      (2)正常狀況下,男性產生含Y染色體的精子在所有精子中所占比例為 。兩種類型精子與含X染色體的卵細胞在 內結合的機會均等,所以新生兒中男女比例相近。


      (3)圖2為Y染色體其及組成示意圖,SRY是① 上的片段。科學家將SRY注射到小鼠受精卵細胞核中,發現含有XX染色體的小鼠卻發育出了睪丸,由此證明 是決定睪丸形成的重要基因。


      (4)睪丸能夠分泌 激素,促進男性生殖器官發育和成熟,激發并維持男性第二性征,如胡須生長、喉結突出等,使男性和女性具有顯著的外形差異。


      答案:


      (1)男性


      (2)1.50%


      2.輸卵管


      (3)1.DNA


      2.SRY


      (4)雄性


      解析:


      (1)方法一:圖一可知體細胞中存在y染色體,所以為男性。


      方法二:分析圖1可知:圖1中的第23對染色體一條大、一條小,為XY染色體,因此圖1表示男性的體細胞中的染色體的組成。


      (2)方法一:形成生殖細胞過程中體細胞成對染色體中的一條進入到生殖細胞中,即產生兩種類型的精子且比例相同。


      方法二:人的體細胞內的23對染色體,有一對染色體與人的性別有關,叫做性染色體;男性的性染色體是XY,女性的性染色體是XX.由于男性可產生數量相等的X精子與Y精子,比例是1:1,兩種類型精子與含X染色體的卵細胞在輸卵管內結合的機會均等,所以每次生男生女的概率是相等的。


      (3)方法一:SRY是基因,基因是具有遺傳效應的DNA片段;將該基因導入到受精卵中,使原本的雌性小鼠產生了睪丸,說明該基因決定睪丸形成。


      方法二:控制生物的性別不僅受染色體控制,還與基因有關,圖2為Y染色體其及組成示意圖,SRY是①DNA上的片段。科學家將SRY注射到小鼠受精卵細胞核中,發現含有XX染色體的小鼠卻發育出了睪丸,由此證明SRY是決定睪丸形成的重要基因。


      (4)方法一:睪丸的功能是產生雄性激素和精子。


      方法二:男性的睪丸能夠產生生殖細胞和分泌雄性激素,性激素能促進第二性征的出現,如男孩出現陰毛、腋毛、胡須以及喉結突出等,還出現聲音洪亮而低沉的變聲現象等。

     

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