1.选择题- (共4题)
1.鸡的性别受性染色体控制,公鸡的性染色体组成为ZZ,母鸡的性染色体组成为ZW。在
鸡中,羽毛的显色需要显性基因C存在,基因型cc的为白色。已知鸡的芦花斑纹由Z染色体上的基因B控制,一只基因型为ccZbW的白羽母鸡跟
一只芦花公鸡交配,子一代都是芦花,如果子代个体相互交配。理论上,后代表现型分离比应是
①后代中公鸡和母鸡之比为:1∶1 ②芦花鸡中公鸡和母鸡之比为:2∶1
③公鸡中芦花和白羽毛之比为:3∶1 ④母鸡中芦花、非芦花、白羽之比为:3∶3∶2


①后代中公鸡和母鸡之比为:1∶1 ②芦花鸡中公鸡和母鸡之比为:2∶1
③公鸡中芦花和白羽毛之比为:3∶1 ④母鸡中芦花、非芦花、白羽之比为:3∶3∶2
2.鸡的性别受性染色体控制,公鸡的性染色体组成为ZZ,母鸡的性染色体组成为ZW。在
鸡中,羽毛的显色需要显性基因C存在,基因型cc的为白色。已知鸡的芦花斑纹由Z染色体上的基因B控制,一只基因型为ccZbW的白羽母鸡跟
一只芦花公鸡交配,子一代都是芦花,如果子代个体相互交配。理论上,后代表现型分离比应是
①后代中公鸡和母鸡之比为:1∶1 ②芦花鸡中公鸡和母鸡之比为:2∶1
③公鸡中芦花和白羽毛之比为:3∶1 ④母鸡中芦花、非芦花、白羽之比为:3∶3∶2


①后代中公鸡和母鸡之比为:1∶1 ②芦花鸡中公鸡和母鸡之比为:2∶1
③公鸡中芦花和白羽毛之比为:3∶1 ④母鸡中芦花、非芦花、白羽之比为:3∶3∶2
2.单项选择- (共6题)
5.
It is obvious that this anti-smoking ____ is mainly aimed at young teenagers.
It is obvious that this anti-smoking ____ is mainly aimed at young teenagers.
A.campaign | B.war | C.battle | D.fighting |
6.
He admitted that when ______ comes to repairing a computer, he had little knowledge of it.
A.he | B.that |
C.this | D.it |
7.
Several years ago they found in England a tomb of a man ____ from around 2,300 B.C.
A.dated B.dating C.dates D.to date
Several years ago they found in England a tomb of a man ____ from around 2,300 B.C.
A.dated B.dating C.dates D.to date
8.
Washington, a state in the United States, was named _____ one of the greatest American presidents.
Washington, a state in the United States, was named _____ one of the greatest American presidents.
A.in favor of | B.by means of . | C.in honour of | D.in spite of |
9.
____ you ask many different questions will you acquire all the information you need to know.
A.If only | B.As far as | C.So long as | D.Only if |
试卷分析
-
【1】题量占比
选择题:(4道)
单项选择:(6道)
-
【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:0
5星难题:0
6星难题:0
7星难题:0
8星难题:6
9星难题:0