The government promised to _____ the accident as soon as possible, so you needn't worry. [ ]

A. look up

B. look over

C. look into

D. look for

下图是一个红绿色盲系谱图，用B、b表示，请据图回答：

色盲遗传属于（）性遗传（填显或隐），色盲基因位于（）染色体上。