题目

某女娄菜种群中，宽叶和窄叶性状是受X染色体上的一对等位基因（B、b）控制的，但窄叶性状仅存在于雄株中，现有三个杂交实验如下，相关说法不正确的是杂交组合父本母本F1表现型及比例1宽叶宽叶宽叶雌株︰宽叶雄株︰窄叶雄株=2︰1︰12窄叶宽叶宽叶雄株︰窄叶雄株=1︰13窄叶宽叶全为宽叶雄株 A. 基因B和b所含的碱基对数目可能不同B. 无窄叶雌株的原因是XbXb导致个体致死C. 将组合1的F1自由交配，F2中窄叶占1/6D. 正常情况下，该种群B基因频率会升高A. 信息归纳 Readers is a popular TV show. It invites people to read aloud on the stage. They can read everything that is worth reading. For example, they can read poems, short stories and letters. By reading aloud, the words on the paper come to life. Many people are the fans of the show. They begin to enjoy reading aloud at home. Now, the show offers them a special place to read across China. It is a reading pavilion(亭子). They are in many cities, including Shanghai, Hangzhou and Xi’an. The pavilion is very small. Only one person can come into it each time. There is a microphone in it and it records people’s voices. Everyone can read for about three minutes in the pavilion. Then the show will pick some of the readers with good voices and emotions(感情)， and invite them to read on TV. People of all ages read in the pavilion. “Reading should be just like singing and talking,” said Dong Qing, the host and producer of the show. “People need a place to express true feelings, and that’s why we set Readers”. If you have a chance to read , catch it and try! Information CardThe things that readers can read on the stage【1】The place that the show offers people to read 【2】The time when people can read in the pavilion【3】The people who can be invited to read on TV 【4】The host and producer of Readers 【5】