一、选择题(6小题,共计48分) 1. 豌豆灰种皮(G)对白种皮(g)为显性,黄子叶(Y)对绿子叶(y)为显性,具有两对相对性状的杂合体(F1)自交后代为F2,下列叙述正确的是( ) A. F1代上结的种子,黄子叶比绿子叶接近于3∶1 B. F1代上结的种子,灰种皮比白种皮接近于3∶1 C. F1代上结的种子,种皮和胚的基因型有9种 D. F1代上结的种子,灰种皮比白种皮接近于1∶1
DURING the War of Resistance Against Japan, I worked at the rural anti-Japanese revolutionary base behind enemy lines. The Beiyue District where I was working
China’s First Data Base of Women’s Documents Emerges IN order to greet the UN Fourth World Conference on Women and promote the academic exchange of women’s
This paper investigates the R&D motivations of various multinationals operating in China,drawing on a large-scale, firm-level dataset of official Chinese stati