The stage of development that follows cleavage is the
(a) Blastocyst
(b) Morula
(c) Trophoblast
(d) Blastocoele

Guida verificata passo dopo passo

Step 1: Understand the process of early embryonic development, which begins with fertilization followed by cleavage, a series of rapid mitotic cell divisions.

Step 2: Recognize that cleavage results in a solid ball of cells called the morula, which is the immediate stage following cleavage.

Step 3: Know that after the morula stage, the embryo develops a fluid-filled cavity called the blastocoele, forming the blastocyst.

Step 4: Identify that the trophoblast is a layer of cells forming the outer layer of the blastocyst, important for implantation but not a stage itself.

Step 5: Conclude that the stage directly following cleavage is the morula, making option (b) the correct developmental stage after cleavage.

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Cleavage

Cleavage is the initial series of rapid mitotic cell divisions following fertilization, resulting in a multicellular embryo without increasing its overall size. This process partitions the zygote into smaller cells called blastomeres, setting the stage for further embryonic development.

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Cleavage: Days 2-3

Morula

The morula is the solid ball of cells formed after several rounds of cleavage. It typically consists of 16-32 blastomeres and represents the stage before the embryo develops a fluid-filled cavity, marking a key transition in early embryogenesis.

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Early Embryonic Development Example 2

Blastocyst

The blastocyst is the stage following the morula, characterized by the formation of a fluid-filled cavity called the blastocoele. It has an outer cell layer (trophoblast) and an inner cell mass, which will give rise to the embryo proper, making it crucial for implantation.

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