英语周报2022-2022外研版九年级德州专版答案

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

22.(12分)某种植物的花色有紫色、白色两种。为探究该植物花色的遗传规律,某生物兴趣小组用该植物的纯种进行杂交实验,实验结果如下:F:紫花x白花全为紫花紫花白花=63:1对此实验结果,该兴趣小组内进行了讨论和交流,对该植物的花色遗传最后得出了如下解释:①由一对基因(A、a)控制的,但含a的雄配子(花粉)部分不育②由多对基因共同控制的(A、a,B、b,C、c……)下列问题(1)如果假设①正确,上述实验F1紫花植株产生的可育雄配子中a的概率是(2)为验证上述⑩②假设,该小组一致同意对F1进行测交实验,请预测两种假设的实验结果:假设①:F1作为母本时,子代表现型及比例为F1作为父本时,子代表现型及比例为假设②:F1作为母本时,子代表现型及比例为,F1作为父本时,子代表现型及比例为如果实验证明假设②是正确的,则上述实验F2中的紫花植株中纯种占

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