Embryology Interview Preparation Guide Add New Question

Embryology Interview Questions and Answers will guide us now that Embryology is the study of the development of an embryo. An embryo is defined as any organism in an early stage well before birth or hatching, or in plants, before germination occurs. Learn Embryology basic and advance concepts or get preparation of Embryology Interview Questions and Answers Guide.

40 Embryology Questions and Answers:

1 :: What are the three types of germ layers that form tissues and organs in animals?

The three germ layers are the ectoderm, the mesoderm, and the endoderm.

Image Diversity: germ layers

2 :: How is the mesoderm (third germ layer) of triploblastic animals formed?

The mesoderm appears from differentiation of endodermal cells that cover the dorsal region of the archenteron.

3 :: What are the archenteron and the blastopore? What is the stage of the embryonic development in which these structures are formed? What are the destinations of the archenteron and of the blastopore?

Archenteron is the tube formed during gastrulation by means of invagination of the blastula wall inside the blatocele. It is the origin of the gastrointestinal tract. Blastopore is the opening of the archenteron to the exterior. The blastopore gives birth to one of the extremities of the digestive tube: the mouth in protostome beings, or the anus in deuterostome beings.

4 :: What is gastrulation? How during gastrulation are the first two germ layers formed? Which are these germ layers?

Gastrulation is the process through which a portion of the blastula wall undergoes invagination inside the blastocele forming a tube called archenteron (primitive intestine). The cells of the inner side of the tube form the endoderm (germ layer) and the cells of the outer side form the ectoderm (another germ layer). It is the beginning of the tissue differentiation in the embryonic development.

6 :: After the morula stage what is the next stage? What is the morphological feature that defines that stage?

After passing the morula stage in which the embryo was a compact mass of cells, the next stage is the blastula stage. In the blastula stage, the compactness is lost and an internal cavity filled with fluid appears inside, the blastocele.

Image Diversity: blastula

7 :: What are the cells produced in the first stage of the embryonic development called?

The cells that resulted from the cleavage (the first stage of the embryonic development) are called blastomeres. In this stage the embryo is called morula (similar to a “morus”, mulberry).

Image Diversity: morula

8 :: What is the cell division during the first stage of the embryonic development called? How is this stage characterized?

The cell division in the first stage of the embryonic developments is called cleavage, or segmentation. In this stage, mitosis occurs from the zygote forming the new embryo.

9 :: What are the four initial stages of the embryonic development?

The four initial stages of the embryonic development are the morula stage, the blastula stage, the gastrula stage, and the neurula stage.

10 :: What are the animal pole and the vegetal pole of the vertebrate egg?

The animal pole of a telolecithal egg is the portion of the egg with little vitellus, it is opposite to the vegetal pole that is the region where the yolk is concentrated.

Image Diversity: animal and vegetal poles
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