Question

The embryo at 16 celled stage is known as
a. Morula
b. Gastrula
c. Blastula
d. Blastomere

Answer 1

In developmental biology, cleavage is the division of cells in the early incipient organism. The cycle follows preparation, with the exchange being set off by the activation of a cyclin-subordinate kinase complex.

Complete answer:
A morula (Latin, morus: mulberry) is a beginning phase incipient organism comprising 16 cells (called blastomeres) in a strong ball contained inside the zona pellucida. A morula is unmistakable from a blastocyst in that a morula (3–4 days after preparation) is a mass of 16 totipotent cells in a circular shape though a blastocyst (4–5 days after treatment) has a depression inside the zona pellucida alongside an inward cell mass. A morula, if immaculate and permitted to stay embedded, will in the long run form into a blastocyst.

The morula is delivered by a progression of cleavage divisions of the early incipient organism, beginning with the single-celled zygote. When the undeveloped organism has partitioned into 16 cells, it starts to take after a mulberry, henceforth the name morula (Latin, morus: mulberry). Inside a couple of days after treatment, cells on the external aspect of the morula become bound firmly along with the development of desmosomes and hole intersections, getting almost undefined. This cycle is known as compaction. The cells outwardly and inside become differentially destined into trophoblast (outside) and inward cell mass (inside) begetters. A cavity structures inside the morula, by the dynamic vehicle of sodium particles from trophoblast cells and assimilation of water. This outcomes in an empty bundle of cells known as the blastocyst.

Hence, the correct answer is option (A).

Note: Depending upon the yolk amount in the egg, the cleavage can be holoblastic (aggregate or whole cleavage) or meroblastic (incomplete cleavage). The shaft of the egg with the most elevated convergence of yolk is alluded to as the vegetal post while the inverse is alluded to as the creature shaft.