Embryogenesis is the process of development of an embryo from a fertilized egg. It involves a series of stages that lead to the formation of a multicellular organism. In the context of the given options:
1. The development of a morula: A morula is an early stage of embryonic development where the zygote undergoes multiple rounds of cell division, resulting in a solid ball of cells. This stage occurs before the formation of a blastocyst.
2. The arrangement of a blastomere into 3 primary germ layers: During embryogenesis, the blastocyst (formed from the morula) undergoes gastrulation, a crucial process where the single-layered blastula is transformed into a three-layered structure known as the gastrula. These three germ layers are the ectoderm, mesoderm, and endoderm, which give rise to different tissues and organs in the body.
3. The arrangement of a morula into a blastocyst: After the morula stage, the embryo develops into a blastocyst, which is a hollow ball of cells with an inner cell mass. The blastocyst is essential for implantation into the uterus and subsequent embryonic development.
In summary, embryogenesis encompasses the formation of a morula, followed by the development of a blastocyst, and eventually leads to the differentiation of three primary germ layers during gastrulation. Each of these stages is crucial for the proper development of an organism from a fertilized egg.
