在遗传学上,相对性状是指:同种____、同一性状的不同表现形式.
I went to see a film with my friend Kitty y .The name of the film was S .It was a a pretty p ,her stepmother(继母)and a handsome prince.We bought the t from the Internet.The film was very i .
用分子的相关知识解释下列生活中的现象,不正确的是( )
下列哪项不是哺乳动物所特有的( )