Question

What's a Gastrula?

Answer 1

Hint: Embryonic development, also known as embryogenesis in developmental biology, is the development of an animal or plant embryo. The fertilization of an egg cell (ovum) by a sperm cell initiates embryonic development (spermatozoon). When an ovum is fertilized, it develops into a single diploid cell known as a zygote.

Complete answer:
Gastrulation is the process by which an embryo develops from a blastula with a single layer of cells to a gastrula with multiple layers of cells. Gastrulation is the first major developmental event that the embryonic disc will go through. The embryo's cells undergo significant movement as they rearrange themselves during this process. As a result, the movement will result in the generation of organs by establishing basic tissue types. Gastrulation is the process by which cells in the blastula rearrange themselves spatially to form three layers of cells.

The blastocoel is a fluid-filled cavity surrounded by a spherical layer of cells called the blastoderm. In mammalian reproduction, the male sperm fertilizes the female egg, resulting in the formation of a zygote. The zygote undergoes numerous cleavages before forming a ball-like structure known as a morula.

Gastrula is an early multicellular embryo made up of two or more germinal layers of cells from which the various organs develop. The gastrula develops from a blastula, which is a hollow, single-layered ball of cells formed by repeated cell division, or cleavage, of a fertilized egg.

Thus, Gastrula is the embryo stage following the blastula when it is a cup-shaped structure made up of three layers of cells. In the third week, the embryo begins to differentiate into three germinal layers, a process known as gastrulation.

Note: The gastrula is trilaminate in triploblastic organisms ("three-layered"). These three germ layers are referred to as the ectoderm (outer layer), mesoderm (middle layer), and endoderm (inner layer) (inner layer). The gastrula is composed of only ectoderm and endoderm in diploblastic organisms such as Cnidaria and Ctenophora. The two layers are also known as the hypoblast and epiblast, respectively.