用四倍体西瓜与二倍体西瓜杂交所得的子一代植株开花后,经适当处

用四倍体西瓜与二倍体西瓜杂交所得的子一代植株开花后,经适当处理。则

A.能产生正常配子,结出种子形成果实     B.结出的果实为五倍体

C.不能产生正常配子,但可形成无籽西瓜   D.结出的果实为三倍体

答案

CD

相关题目

任意给定一个非零数,按下列程序计算,最后输出的结果是
任意给定一个非零数,按下列程序计算,最后输出的结果是(    )          A.               B.                C.+1         
After the earthquake, the Haitian people needed to be helped ______. A. occasion
After the earthquake, the Haitian people needed to be helped ______. A. occasionally          B. anxiously           C. practically             D. urgently
下列过程属于人工固氮的是(   )A.分离液态空气制氮气
下列过程属于人工固氮的是(   )A.分离液态空气制氮气               B.闪电时N2 转化为NO C.合成氨                         
下图为局部区域经纬网图,读图回答问题。 关于图中各地的
下图为局部区域经纬网图,读图回答问题。 关于图中各地的叙述,正确的是 A.①、③两地时刻不同,日期相同 B.②、④两地的区时相差18小时 C.③
雄果蝇体细胞中有四对染色体,有丝分裂中期,细胞中有染
雄果蝇体细胞中有四对染色体,有丝分裂中期,细胞中有染色体数、染色单体和DNA分子数目分别是A.8、16、16        B.8、8、8           C.16、0、16
填入下面横线处的句子,与上下文衔接最恰当的一组是  (
填入下面横线处的句子,与上下文衔接最恰当的一组是  (    )  “陆上丝绸之路”是中国古代通向西方的贸易通道,从西安出发,经新疆的南路和
There ________ plenty of good dictionaries in the bookstore. You can choose the
There ________ plenty of good dictionaries in the bookstore. You can choose the one       you like.       A. was         B. were         C. is             
The boy, all teachers considered _____ was caught ______ in the exam, which was
The boy, all teachers considered _____ was caught ______ in the exam, which was absolutely astonishing. A. to be the best; cheating                      B. as the best studen

最新题目