LUE asked in 科學其他:科學 · 1 decade ago

基因問題(生物學)

關於生物學的疑問?

基因密碼的秘密和基因DNA突變是什麼?請詳細回答給我

請盡快給我答覆

感激不盡!!

2 Answers

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  • Tiger
    Lv 5
    1 decade ago
    Favorite Answer

    基因突变是指DNA分子中发生碱基对的替换、增添和缺失,而引起的基因结构的改变,叫基因突变(gene mutation)。它包括单个碱基改变所引起的点突变(point mutation),或多个碱基的缺失、重复和插入。Regarding 基因, I suggest you refer the following links:

    圖片參考:http://life.nthu.edu.tw/~b861614/gene/images/title...

      話說從頭本網站的製作緣起發現基因遺傳物質-基因的發現史DNA正傳認識DNA生物技術研究基因的相關分子生物技術基因快報當今生物科技的發展新聞網路資源來看看網路上有什麼相關資訊吧製作小組生科01絕代雙嬌Genes are the units of heredity in living organisms. They are encoded in the organism's genetic material (usually DNA or RNA), and control the physical development and behavior of the organism. During reproduction, the genetic material is passed on from the parent(s) to the offspring. Genetic material can also be passed between un-related individuals (e.g. via transfection, or on viruses). Genes encode the information necessary to construct the chemicals (proteins etc.) needed for the organism to function.Following the discovery that DNA is the genetic material, and with the growth of biotechnology and the project to sequence the human genome, the common usage of the word "gene" has increasingly reflected its meaning in molecular biology, namely the segments of DNA which cells transcribe into RNA and translate, at least in part, into proteins. The Sequence Ontology project defines a gene as: "A locatable region of genomic sequence, corresponding to a unit of inheritance, which is associated with regulatory regions, transcribed regions and/or other functional sequence regions".1 Overview 1.1 Properties of genes 1.2 Types of genes 1.3 Human gene nomenclature 1.4 Typical numbers of genes in an organism 2 Chemistry and function of genes 2.1 Chemical structure of a gene 2.2 Expression of molecular genes 2.3 Mutations and evolution 3 History 4 Evolutionary concept of gene 5 See also 6 References 7 External links

    Source(s): from Tiger & google.com
  • 1 decade ago

    基因密碼是三組密碼組成,如ACA.CTG.

    A(腺嘌呤) . T(胸腺嘧啶) . C(胞嘧啶) . G(鳥糞嘌呤) 這四個去氧核醣核酸.

    胺基酸有很多種,基因密碼代表胺基酸的種類.

    蛋白質是由各種胺基酸組成.

    基因DNA突變:

    1.在去氧核醣核酸連接中,是A連T .C連G.

    有連錯的情形,如A連C.T連G

    2.有一個DNA一端過長或過短

    3.某蛋白質的組成基因中的密碼出錯,如:某蛋白質中有AGA這種胺基酸

    但基因突變變成ATA這種胺基酸,造成功能不正常

    4.染色體多一條或少一條

    5.等............

    原因有很多種

    1.氧的自由基---在把葡萄糖轉成能量時,有時會產生氧的自由基,自由基會破壞DNA,這就是"老化"

    2.自己突變---在基因複製或其他情形時會有一定機率突變,一個基因是十萬分之一

    3.外來因素---藥品.輻射.食品等因素造成基因突變

    Source(s): 我~~~~~~~~~~~(茶)
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