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Cleavage in Sea Urchin Development

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Questions and Answers

What is the arrangement of cells in the blastoderm?

Two layers, the epiblast and hypoblast, enclosing a fluid-filled cavity (correct)

A single layer of cells

A disorganized mass of cells

Three layers, with the epiblast and hypoblast surrounding a yolk sac

What type of cleavage occurs in species with little or moderate amounts of yolk, such as sea urchins and frogs?

Compaction

Trophoblast formation

Meroblastic cleavage

Holoblastic cleavage (correct)

In mammalian cleavage, what is the process that results in a compact blastomere structure?

Gastrulation

Compaction (correct)

Trophoblast formation

Implantation

What is the primary function of the trophoblast cells in mammalian embryonic development?

Form the placenta (chorion) to enable nutrient and oxygen exchange Signup and view all the answers

What is the structure that develops from the inner cell mass of the blastocyst?

The embryo and extraembryonic membranes Signup and view all the answers

What facilitates the implantation of the blastocyst in the uterus?

The trophoblast secretes enzymes Signup and view all the answers

What process begins after the completion of implantation in human embryonic development?

Gastrulation Signup and view all the answers

What is the structure formed by the inner cell mass after implantation?

A flat thick disk with an upper epiblast and a lower hypoblast Signup and view all the answers

Which of the following statements about mammalian cleavage is incorrect?

Trophoblast cells participate in forming the embryo Signup and view all the answers

What is the primary function of the blastocoel in early embryonic development?

To provide a fluid-filled cavity for the developing embryo Signup and view all the answers