皮皮学，免费搜题
登录
搜题
【单选题】
已知西瓜红瓤（R）对黄瓤（r）为显性。黄瓤西瓜自交产生的种子萌发后用秋水仙素处理，以得到的四倍体为母本，纯合二倍体红瓤西瓜为父本，杂交获得三倍体。该三倍体开花后授以纯合二倍体红瓤西瓜花粉，则所结无籽西瓜瓜瓤的颜色和基因型分别是（）A.
红瓤，Rrr
B.
红瓤，RRr
C.
红瓤，RRR
D.
黄瓤，rrr
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】下列不是高血压发病危险因素的是
【简答题】小题1:This is one of the ________(big) rabbits in the world. He eats 12 carrots, six apples and two cabbages every day. 小题2:My neighbor Helen never talks to me. She is so ______（friendly） 小题3:As we know...
【简答题】成人缺铁性贫血的主要原因是（ ）
【简答题】My 15-year-old brother John and I saw the coat at the same time. The thick black wool of the coat was soft, and it only 28 dollars. We looked at each other, saying , but John’s face was shining with j...
【简答题】词形转换。 1. This is one of the ______ (big) rabbits in the world. He eats 12 carrots, six apples and two cabbages every day. 2. My neighbor Helen never talks to me. She is so ______ (friendly) 3. As we k...
【单选题】John and I have just been telling stories two of us.
A.
ourselves
B.
to each other
C.
each of us
D.
both
相关题目：
参考解析：
知识点：
题目纠错 0
发布
