A:what; but that
B:because; but what
C:what; but because
D:that; but that
有无酒窝是一对相对性状,有酒窝由显性基因D表示,无酒窝由隐性基因d表示。
①写出有酒窝的基因组成____。②写出无酒窝的基因组成____。
—It's too complex, I think.
—______. So we'd better make it easier for students to get involved.
读图,完成后面小题:
下列关于细胞膜的流动性和选择透过性的叙述,不正确的是( )