試題詳解

30. What would be the consequence if gastrulation did not occur? |
(A) Cleavage would not occur in the zygote.
(B) Embryonic germ layers would not form. I
(C) Fertilization would be blocked.
(D) The blastula would not be formed. 是
(E) The blastopore would form above the gray crescent in the animal pole. j：