问题
选择题
To her anger, when she sat down, she found a piece of paper on her desk _____ “Stupid Sarah got a D!”
A.that saying
B.on which written
C.that was read
D.saying
答案
答案:D
To her anger, when she sat down, she found a piece of paper on her desk _____ “Stupid Sarah got a D!”
A.that saying
B.on which written
C.that was read
D.saying
答案:D
研究人的舌能否像中间卷起这一性状时,调查了100个家庭,结果如下表:
类型 | 家庭(个) | 父母性状 | 子女数(个) | 子女性状 |
A | 44 | 一方能卷舌,另一方不能卷舌 | 50 | 29人能卷舌, 21人不能卷舌 |
B | 26 | 父母均能卷舌 | 29 | 21人能卷舌, 8人不能卷舌 |
C | 30 | 父母均不能卷舌 | 33 | 均不能卷舌 |
(1)从上述调查结果看,所研究的性状中,显性性状是______,隐性性状是______.
(2)如果一对夫妇均能卷舌,却生了一个不能卷舌的孩子,这对夫妇的基因组成(显性基因为A,隐性基因为a)应分别是______.
(3)如果一对夫妇中,父方不能卷舌,母方能卷舌,生了一个不能卷舌的孩子,那么这对夫妇的基因组成分别是______.