Joe will have his father's gold watch because it is handed through in the family.

A．handed up

B．handed below

C．handed down

D．handed downwards

有关基因的说法正确的是（）

①基因突变是新基因产生的途径

②基因中脱氧核苷酸的排列顺序代表遗传信息

③分离定律和自由组合定律是指不同世代间基因的传递规律

④基因突变发生在体细胞中，则不能遗传

⑤种群中基因频率的改变不一定会导致新物种的形成

A.①②③④

B.①②③⑤

C.①②④⑤

D.①③④⑤