题目内容

昆虫产生14个副体节与何种基因的表达有关？

A. dorsal基因
B. gap基因
C. pair-rule基因
D. bicoid基因

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两侧对称的动物有哪些体轴？果蝇胚胎前后轴的建立和分化的机制是什么？

简要回答果蝇胚胎背腹轴分化的机制？

What does Zhang Ling want to do? ______

A. To book a room.
B. To check in.
C. To pay the bill.
D. To check out.

What should be returned to the hotel when a guest checks out?______

A. The room card.
B. The bill.
C. The luggage.
D. The shuttle bus.