隐性基因控制的生物性状没有表现，这种基因就不会遗传给后代。          (    )

我国很早就有人掌握了养蚕、编织丝绸等技术。其中有一道工序是将蚕茧用热水浸泡后缫丝，此时茧内的家蚕发育到哪一阶段                   （ ） 

— Mr. Hurst, could I join in your after-class activity from tomorrow on?

— Of course, Jenney. You can come every Tuesday and Friday afternoon.