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Biology Questions and Answers including Embryonic Development Extra embryonic Membranes
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Buyer: Victoria Proctor (vicproc6@gmail.com)Biology Questions and Answers
The animal pole of a telolecithal egg is
Embryonic the portion of the egg with little vitellus,
it is opposite to the vegetal pole which
Development is the region where the yolk is
concentrated.
1. What is the cell division
process directly related to the 4. What are the four initial
embryonic growth? stages of the embryonic
development?
The embryonic growth depends directly
on mitosis. Through this type of cell The four initial stages of the embryonic
division the zygote divides itself giving development are the morula stage, the
birth to a series of cells that by mitosis blastula stage, the gastrula stage and
also compose differentiated tissues and the neurula stage.
organs until the formation of a complete
individual.
5. What is the cell division
during the first stage of the
2. What is the function of the embryonic development
vitellus in the vertebrate egg? called? How is this stage
How are these eggs classified characterized?
according to the amount of
vitellus within them? The cell division in the first stage of the
embryonic developments is called
Vitellus (yolk) is the nutritive material cleavage, or segmentation. In this stage
that accumulates in the cytoplasm of several mitoses occur from the zygote
the egg (zygote) with the function of forming the new embryo.
nourishing the embryo. According to the
amount of vitellus in them, the
vertebrate eggs are classified as
oligolecithal (little yolk), centrolecithal, 6. What are the cells produced
or heterolecithal (more yolk diffusely in the first stage of the
distributed) and telolecithal (more yolk embryonic development
concentrated in one end of the egg). called?
The cells that result from the cleavage
(the first stage of the embryonic
3. What are the animal pole
development) are called blastomeres. In
and the vegetal pole of the this stage the embryo is called morula
vertebrate egg? (similar to a “morus”, mulberry).
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, Buyer: Victoria Proctor (vicproc6@gmail.com)
Biology Questions and Answers
7. After the morula stage what What are the archenteronand
is the next stage? What is the the blastopore? What is the
morphological feature that stage of the embryonic
defines this stage? development in which these
structures are formed? What
After passing the morula stage in which are the destinations of the
the embryo is a compact mass of cells, archenteron and of the
the next stage is the blastula stage. In blastopore?
the blastula stage the compactness is
lost and an internal cavity filled with Archenteron is the tube formed during
fluid appears inside, the blastocele. 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
8. After the blastula stage archenteron to the exterior. The
what is the following stage of blastopore gives birth to one of the
the embryonic development? extremities of the digestive tube: the
What is the passage from mouth in protostome beings, or the
blastula to the next stage anus in deuterostome beings.
called?
The blastula turns into gastrula in a 11. How is the mesoderm
process known as gastrulation. (third germ layer) of
triploblastic animals formed?
9. What is gastrulation? How The mesoderm appears from
differentiation of endodermal cells that
during gastrulation are the
cover the dorsal region of the
first two germ layers formed? archenteron.
What are these germ layers?
Gastrulation is the process through
which a portion of the blastula wall 12. What are the three types
undergoes invagination inside the of germ layers that form
blastocele, forming a tube called tissues and organs in animals?
archenteron (primitive intestine). The
cells of the inner side of the tube form
the endoderm (germ layer) and the cells The three germ layers are the
of the outer side form the ectoderm ectoderm, the mesoderm and the
(another germ layer). It is the beginning endoderm.
of the tissue differentiation in embryonic
development.
10.
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