Compare and contrast the structures of the zygote, morula, and blastocyst.
Compare and contrast the structures of the zygote, morula, and blastocyst.
After the egg cell's fusion with a sperm cell (that is, after fertilization), the diploid cell is termed as a zygote that divides and differentiates to form the offspring. The different stages of growth are termed differently, and each stage has a characteristic structural organization.
The structure of a zygote consists of one single cell along with two polar bodies (the polar bodies degenerate during development). This single-celled zygote divides to form the morula, which comprises 16 compactly arranged cells. The morula forms a cavity within its structure by draining out fluid after it enters the uterine lumen. This pre-embryonic structure with 16 compactly arranged embryoblast cells and a cavity are termed a blastocyst.
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