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如果在一个豌豆种群中基因型aa与aa的比例为12将这批豌豆种子种下去自然状态下其子一代个体中aaaaaa种子数之比为a．321 Template






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tomski如果在一个豌豆种群中基因型aa与aa的比例为12将这批豌豆种子种下去自然状态下其子一代个体中aaaaaa种子数之比为a．321 coloring
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如果在一个豌豆种群中基因型AA与Aa的比例为12将这批豌豆种子种下去自然状态下其子一代个体中AAAaaa种子数之比为 A．32 sketch template
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如果在一个豌豆种群中基因型AA与Aa的比例为12将这批豌豆种子种下去自然状态下其子一代个体中AAAaaa种子数之比为A．321 sketch template
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10．基因型为Aa的豌豆连续自交后代中纯合子和杂合子的基因型率如图所示下列分析正确的是 A．据图中曲线可以判断该豌豆种群生了进化B sketch template
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如果在一个豌豆种群中基因型AA与Aa的比例为12将这批豌豆种子种下去自然状态下其子一代个体中AAAaaa种子数之比为A．321 sketch template
view template
若在一个种群中AA的比例为25%Aa的比例为50%aa的比例为25%．已知基因型aa的个体失去求偶和繁殖能力则该种群个体自由交配一代后 sketch template
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如果在一个豌豆种群中基因型AA与Aa的比例为12将这批豌豆种子种下去自然状态下其子一代个体中AAAaaa种子数之比为A．321 sketch template
view template
17．不同的基因在种群基因库中所占比例是不同的现从某个种群中随机抽出100个个体测得基因型为AAAaaa的个体分别是306010个 sketch template
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亲本基因型为Aa的豌豆自交在子一代中从理论上讲基因型为纯合子的占总数 A0B14C12D34——青夏教育精英家教—— sketch template
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题目如果在一个种群中基因型AA的比例为25%基因型Aa的比例为50%基因型aa的比例为25%已知基因型为aa的个体失去求偶繁殖能力 sketch template
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如果在一个种群中基因型的比例为25%基因型Aa的比例为50%基因型aa的比例为25%已知基因型aa的个体失去繁殖能力在随机交配产生的 sketch template
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17．不同的基因在种群基因库中所占比例是不同的现从某个种群中随机抽出100个个体测得基因型为AAAaaa的个体分别是306010个 sketch template
view template
如果在一个种群中基因型的比例为25%基因型Aa的比例为50%基因型aa的比例为25%已知基因型aa的个体失去繁殖能力在随机交配产生的 sketch template
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如果在一个种群中基因型AA的比例占25%基因型Aa的比例占50%基因型aa占25%已知基因型aa的个体失去求偶和繁殖的能力则随机交配 sketch template
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在一个种群中随机抽出一定数量的个体其中基因型为AA的个体占16%基因型为Aa的个体占78%aa的个体占6%基因A和a的率分别是A sketch template
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下图中甲乙丙丁分别表示四株豌豆细胞中染色体和基因的组成AaBb表示两对等位基因分别控制两对不同的相对性状请据图回答1若甲 sketch template
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假设在某一个群体中AAAaaa三种基因型的个体数量相等A和a的基因率均为50%当自然选择分别对隐性基因或显性基因不利时对应的有利 sketch template
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下图表示不同基因型豌豆体细胞中的两对基因及其在染色体上的位置这两对基因分别控制两对相对性状从理论上说下列分析不正确的是A．甲乙植株杂交 sketch template
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玉米是一种雌雄同株植物下表表示5个玉米纯系的表现型相应的基因型及基因所在的染色体其中 品系均只有一个性状属隐性其他性状均为显性 sketch template
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如果在一个种群中基因型AA的比例占25%基因型Aa的比例占50%基因型aa的比例占25%已知基因型aa的个体失去求偶繁殖能力则随机 sketch template
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某雄性动物的基因型为AaBb，下图1为其一个精原细胞的减数分裂过程，图2为减数分裂过程中的两个不同时期的细胞分裂图像。请回答下列问题。 1 sketch template
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如图的遗传图解中双眼皮基因用“A 表示单眼皮基因用“a 表示．如果一对夫妇父亲的基因组成是“aa 其性状为单眼皮母亲的基因组成是 sketch template
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题目下列关于基因率基因型率与生物进化的叙述正确的是A 在一个种群中某等位基因中各种基因率之和为1B 在一个种群中基因型 sketch template
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下列关于基因率基因型率与生物进化的叙述正确的是 A． 个种群中控制对相对性状的各种基因型率的改变说明物种在不断变化B．在一个 sketch template
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如果基因型为AAAaaa的一个种群后代在某一环境中的生存能力或竞争能力是AA=Aa＞aa则在长期的选择过程中不正确的是 A．这 sketch template
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在下列基因的组合中能表现出相同的生物性状的是A．AA AaB．aa AaC．aa BbD．BB Aa——青夏教育精英家教—— sketch template
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等位基因A/a位于某种昆虫的常染色体上该种昆虫的一个数量非常大的种群在进化过程中a基因的率与基因型率之间的关系如图．以下叙述正确的 sketch template
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13．如果在一个种群中基因型AA的比例占25%基因型Aa的比例为50%基因型aa的比例占25%．已知基因型aa的个体失去求偶和繁殖的能力 sketch template
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有一个随机交配的种群在没有迁移等条件下两年内该种群的基因型率的变化如下表根据现代生物进化理论在这两年中与这对基因有关的推断正确的 sketch template
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有一个随机交配的种群在没有迁移等条件下两年内该种群的基因型率的变化如下表根据现代生物进化理论在这两年中与这对基因有关的推断正确的 sketch template
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已知某一对染色体三体的植物在减数第一次分裂过程中3条同源染色体随机移细胞两极最终可形成含1条或2条该染色体的配子．现有一个三体且一条 sketch template
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如果在一个豌豆种群中基因型AA与Aa的比例为12将这批豌豆种子种下去自然状态下其子一代个体中AAAaaa种子数之比为A．321 sketch template
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不同细胞的分裂方式有所不同下列有关的说法正确的是 A．生物的体细胞均可通过有丝分裂无丝分裂和减数分裂三种方式进行增殖 B．植物细胞 sketch template
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下列有关DNA结构及功能的叙述中正确 A已知某染色体上的DNA分子中G碱基的比例为20%那么由此DNA克隆出来的某基因中碱基C的 sketch template
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在一个基因库中显性基因与隐性基因的比例相等如果每一代隐性基因型的个体都不能产生后代则 A．对基因型的比例影响很小 B．会降低隐性 sketch template
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种群分布型 智汇三农 sketch template