The Blastopore is a Structure That First Becomes Evident During

Question

The blastopore is a structure that first becomes evident during
A)fertilization.
B)gastrulation.
C)the eight-cell stage of the embryo.
D)coelom formation.
E)cleavage.

Accepted Answer

The blastopore is a structure that forms during gastrulation, which is the process by which the blastula (a hollow ball of cells) is transformed into a three-layered embryo with distinct germ layers. The blastopore is the point of invagination (folding inward) on the surface of the blastula that later becomes the opening to the archenteron (the embryonic precursor to the digestive tract) and ultimately forms the mouth or anus of the developing organism.