下列的叙述是 ①非同源染色体之间染色体片段的交换属于染色体变异 ②基因**组合定律的来自实质是:F_1产360问答生配子时,等位基因分离,非等位基因**组合 ③基因型Dd的豌豆经减数**会产生雌雄各两种配子,雌雄配子比例为1:甚巴每1 ④豌豆的灰种皮(G)与白种坏夫而益理较皮(g)植株相互授粉,它们的种子全部为灰种皮 A. 都正
C
下列变异中,不属于染色体结构变异的是()①非同源染色体之问相互交换片段;②同源染色体之间通过互换交换片段...
C
非同源染色体之间染色体片段的交叉互换属于来自基因重组吗
不360问答属于高中生物中,基因组合的实例有三:减一非同源染色体**组合,减一姐妹染色单体交叉互换,基因工程技术.如果是同源染色体的非姐妹染色赶菜约改肥斯高建单体交叉互换,则为基...
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非同源染色体之扬武老杆喜间染色体片段的交叉互换属于基因重组吗
个人理解基因重组分两方面:前期i的偶附划题成线期,同源染色体非姐妹染色单体的交叉互换;后期i,非同源染色体的自标检说两混由组合。而非同源染色体的交叉互换属于染色体结构变异中的易位...
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下列情况引起的变异属于基因重组的是 ①非同源染色体上非等位基因的**组合 ②一条染色体的某一片段移接到另一条非同源染色体...
C基因重组有两种情况:一是在减数第一次**的四分体时期同源染色体的非姐妹染色单来自体之间发生的交换,二是减数第一次**后期非同源染色体上的非等位基因的**组合。
以下属于染色体变异的是()。①同源染色体之间部分片段的交换②染色体上的一些片段的增添或缺失③非同源染色体的**组合皮点掉鲁节应企胜肥煤照...
A解析: ①同文封雨固言收源染色体之间非姐妹愿毫展染色单体之间部分片段的交换仅属究红胶井成失算料属于基因重组,①错误; ②染色体上的一些片段的增添或缺失属于染色造阿脸强汽初酸体结...
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细胞在有丝**和减数**中都可能产生变异,下列叙述中仅发生在减数**过程中的可遗传变异是( )A.DNA复制时受诱变因素影响,发生基因突变B.染色体不分离或不能移向两极,导致染色体数来自目变异C.非同源染色体之间360问答发生片段交换,导致染色体结构变异D.同源染色体的非姐妹染色单体之间发生没获片段交换,导致基因重
试题答案:D试题互队反占脱养抗同解析:试题分析:基因突变发生在有丝**间期或减数第一次**间期;染色体变异(包括染色体数目变异和染色体结构变异)在有丝**和减数**过程中都有可能...
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各种可遗传的变异大多发生在细胞**过程中,下列变异仅发生在减数**过程的是A.染色体不分离或不能移向两极,导致染色体数目变异B.非同源染色体投分小切新乙存宜钱**组合,导致基因重组C.染色体复制时受诱变因素影响,导致基因突变D.非同源染色体之间某片段易位,导致染色体结构变异
试题答案:B试题解析:试题分析:染色体变异可以发生在有丝**过程中,故A、C、D错误。非同源染色体**组合,只能发生在减数**过程中,故B正确。考点:本题考查变异相关知识,意在考...
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绿箭广告优缺点?
绿箭广告的优缺点如下:绿箭广告的优点:绿箭广告之所以存在时有其特殊意义的,它可以传达出平面的信息、品牌、形象从而吸引消费。具体主要包括下列几个方面:1、准确表达广告信息,广告设计...
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小乘佛教和大乘佛教在宣传教义方面有什么区别?
嗯,楼主这个问题,单来自纯从教义上讲,小乘佛法,重视360问答自身内在的修练,其修练范围涵盖了从肉体,到知觉,到**,到情绪、到精神的各个层面,目的,是通过这样对自身全方位的修练...
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小乘佛教和大乘佛教在宣传教义方面有什么区别?言
嗯,楼主这个问题,单纯从教义上讲,小乘佛法,重视自身内在的修练,其修练范围涵盖了从肉体,到知觉,到意360问答识,到情绪、到精神的各个层面以布二阳过,目的,是通过这样对自身全方位...
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下列有关基因突变和基因重组的叙述,正确的来自是( )
spanC解析:解:A、DNA分子缺失一个基因属于染色体结构变异中的缺失,DNA分子缺失一个碱基属于基因突变,A错误;B、基因突变是不定向的,人工诱导只能提**养样节跳失优训究活...
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下列选项中都属于基因重组的是( )
C染色体的某一片段移接到另一条非同源染色体上属于染色体结构变异;DNA碱基对的增添、缺失属于基因突变。