NEET BIOLOGY

Detailed explanation-1: -This process is called organogenesis. Organs develop from the germ layers through the process of differentiation. During differentiation, the embryonic stem cells express specific sets of genes that will determine their ultimate cell type.

Detailed explanation-2: -Organogenesis is important for the concurrent development of multiple organs and organ systems. Organs arise from the endoderm, ectoderm, and mesoderm; the three primary germ cell layers are established during gastrulation. Each of these layers is derived from the epiblast. By week eight, organogenesis is complete.

Detailed explanation-3: -Embryonic differentiation is the process of development during which embryonic cells specialize and diverse tissue structures arise. Animals are made up of many different cell types, each with specific functions in the body.

Detailed explanation-4: -During the third week after fertilization, the embryo begins to undergo cellular differentiation. Differentiation is the process by which unspecialized cells become specialized.

Detailed explanation-5: -These changes are due to alterations in the set of genes expressed in the cells. Eventually, the cells of the embryo are split into three different groups known as germ layers: mesoderm, endoderm, and ectoderm. Each germ layer will, under normal conditions, give rise to its own specific set of tissues and organs.