Question

In many embryos, differentiation begins at the following stage:

Options

• cleavage

• blastula

• gastrula

• neurula

Answer 1

Gastrula

Explanation:

Differentiation begins at the gastrula stage when the three primary germ layers (ectoderm, mesoderm, and endoderm) form, starting the process of cell specialization. Earlier stages like cleavage and blastula primarily involve cell division and formation of the blastocoel, not differentiation. Neurula stage follows gastrulation and involves the formation of the nervous system.