A.培育的无籽西瓜没有后代,属于不可遗传的变异 |
B.四倍体植株与二倍体杂交所结的西瓜,果肉细胞内含有3个染色体组 |
C.也可让四倍体做父本,二倍体做母本杂交得到三倍体从而获得无籽西瓜 |
D.获得无籽西瓜的过程中两次用到花粉,两次使用花粉的作用不同 |
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2