Which of the Following Correctly Displays the Sequence of Developmental

Question

Which of the following correctly displays the sequence of developmental milestones?
A) cleavage → blastula → gastrula → morula
B) cleavage → gastrula → morula → blastula
C) cleavage → morula → blastula → gastrula
D) gastrula → morula → blastula → cleavage
E) morula → cleavage → gastrula → blastula

Accepted Answer

Cleavage is the first stage after fertilization, where the zygote undergoes rapid cell division without growing in size, leading to the formation of a morula, a solid ball of cells. This then forms a blastula, a hollow ball of cells, which subsequently undergoes gastrulation to form a gastrula, where the germ layers differentiate.