将基因型为AABBCC和AaBbCc的向日葵杂交,按基因自由组合规律,后代中基因型为AABBCC的个体比例应为[ ]
A.1/8
B.1/16
C.1/32
D.1/64
答案:A
He will take up _______ ones if he has a lot of different tasks to choose from.
A.tough
B.tense
C.bad
D.instant
双子叶植物中,营养物质贮存在[ ]
A.胚芽
B.子叶
C.胚乳
D.胚轴