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【简答题】
有一大麦杂交组合，F2代的芒性状表型有、长芒和短芒三种，观察株数依次分别为348，115，157。试检验其比率是否符合9∶3∶4的理论比率。
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皮皮学刷刷变学霸
举一反三
【单选题】What does Carol tell us about her father?
A.
He told no one about his disease.
B.
He worked hard to pay for his medication.
C.
He depended on the nurses in his final days.
D.
He had stayed in the hospital since he fell ill.