MICROANATOMY

Detailed explanation-1: -Gastrulation is defined as an early developmental process in which an embryo transforms from a one-dimensional layer of epithelial cells (blastula) and reorganizes into a multilayered and multidimensional structure called the gastrula.

Detailed explanation-2: -The zygote divides into multiple cells in a process known as cleavage, triggering the beginning of embryonic differentiation. During cleavage, the zygote divides but maintains its size in the process. This zygotic division produces blastomeres which later make up the hollow sphere known as the blastula.

Detailed explanation-3: -During embryo development, the processes of differentiation are controlled by temporal and spatial patterns of gene expression. In embryos reconstructed by nuclear transfer, the donor genetic material must respond to the cytoplasmic environment of the cytoplast and recapitulate this normal developmental process.