During gastrulation,
A) the blastodisc is formed.
B) the placenta is formed.
C) germ layers are formed.
D) cells from the ectoderm move to the endoderm.
E) all of the above

Question

Quizplus · Accepted Answer

During gastrulation, the three germ layers (ectoderm, mesoderm, and endoderm) are formed, which will later differentiate into different tissues and organs. The blastodisc is formed during fertilization, and the placenta is formed during embryonic development but not specifically during gastrulation. Cells do move during gastrulation, but it is more accurate to say that cells undergo migration and rearrangement to form the germ layers.

During Gastrulation