扩豌豆进行遗传试验时，下列操作错误的是

【名词&注释】

垃圾邮件(spam)、染色质(chromatin)、人工授粉(artificial pollination)、传递信息(transfer information)、雌雄同株(hermaphrodite)、孟德尔(mendel)、自花授粉(self-pollination)、报春花属(primula)

[单选题]扩豌豆进行遗传试验时，下列操作错误的是

A. 杂交时，须在开花前除去母本的雄蕊
B. 自交时，雌蕊和雄蕊都无需除去
C. 杂交时，须在开花前除去母本的雌蕊
D. 人工授粉后，应套袋

查看答案&解析查看所有试题

学习资料：

[单选题]seize

A. neighbour
B. weigh
C. eight
D. receive

[单选题]What has the woman decided to do on Sunday aftermoon?

A. To attend a wedding+
B. To visit an exhibition.
C. To meet a friend.

[单选题]For these reasons,I believe that lawmakers need to legislate (立法) against spam.Spammers should be fined,and perhaps sent to prison if they continue to disturb people.E-mail is a tool which helps people all over the world to communicate conveniently,but spam is destroying this conwenience.57.What does the underlined word “correspondence” in the Paragraph 1 probably mean?

A. messages
B. ideas
C. connections
D. programs

[单选题]下列各句括号中补出的省略成分，不正确的一项是（ ）（参考改编绍兴一中期末调研卷）

A. 立召公子跪（于）庭下
B. 公命录（汪琬文）以入
C. 民共阖城门，（汤公）不得出
D. 而汤公位（之）开府

[单选题]染色质和染色体是同一物质不同阶段所表现出来的不同形态。( )

A. 正确
B. 错误

[单选题]花腋生。

A. 玉兰
B. 含笑
C. 鹅掌楸
D. 木莲

[单选题]的特征是叶全基生，花葶顶生伞形或复伞形花序。

A. 报春花属^(primula)
B. 点地梅属
C. 珍珠菜属
D. A和B

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