试题与答案

"Not having returned home yet, _____", h

题型:选择题

题目:

"Not having returned home yet, _____", his father said to the police. [ ]

A. his mother got worried

B. his mother must be worried

C. I think he is missing

D. he must have got into some trouble.

答案:

答案:D

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题型:解答题

某班学生按老师的要求每人调查了5个家庭中各个成员耳垂的性状,调查结果统计如下表:

组别父母性状调查的家庭数子女性状
有耳垂无耳垂
1有耳垂有耳垂624715
2无耳垂无耳垂56056
3有耳垂无耳垂775324
4无耳垂有耳垂806416
如果A表示控制显性性状的基因,a表示控制隐性性状的基因.请据表分析并回答:

(1)从第1组的结果可以推测出______耳垂是隐性性状.

(2)第2组中的某个家庭,再生一个有耳垂孩子的可能性是______.

(3)第3组中,母亲的基因组成为______,父亲的基因组成为______.

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