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【简答题】
已知某三体植株,参加受精的胚囊中,染色体数为 n+1的占25%;参加受精的花粉中,染色体数为n+1的只占10%。现将该三体与正常二体杂交,问: ( 1)、若以该三体为母本,则子代中的二体、三体、四体各比例? ( 2)、若以该三体为父本,其子代中的二体、三体、四体各比例?
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反馈参考答案：
举一反三
【单选题】Young people often blame that ______.
A.
their parents don't understand the modern society
B.
their parents always give them too much pressure
C.
their parents don't show enough concern about their health
D.
their parents don't earn enough money to support them financially
【简答题】P33 -1 简述气硬性胶凝材料和水硬性胶凝材料的区别。
【简答题】Important people don’t often have much free time as their work ________ all their time. A) takes away B) takes over C) takes up D) takes in
【简答题】第7章作业
【单选题】—People often don't appreciate what they have, do they? —No, _________ they lose it.
A.
if
B.
after
C.
until
D.
when
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