基因型为AaBbCc(独立遗传)的一个初级精母细胞和一个初级卵母细胞分别产生的精子和卵细胞基因型的种类数比为 [ ]
A.4:1
B.3:1
C.2:1
D.1:1
答案:C
—Look! There is beautiful rainbow in the sky.
—Take the books for me, I’d like to take a photo of rainbow before it disappears.
A.a; the
B.the; a
C.the; the
D.a; a
网络三剑客是哪三个软件?