Embryology Exam 1/ Quiz 1 questions with
verified answers
Gametogenesis
the process of formation and
development of specialized generative cells, gametes
(oocytes/sperms) from bipotential primordial germ cells
Gametogenesis involves what parts of the gametes?
chromosomes and cytoplasm
Human fertilization is
the union of an egg
and sperm occurring primarily in
the ampulla of the fallopian tube
Zygote
fertilized egg
primordial germ cells
Precursor of germ cells, become oocytes or spermatozoa in the adult
when and where do primordial germ cells originate?
in the bilaminar disc (epiblast)
during the second week and
move through the primitive
streak during gastrulation,
migrating to the wall of the
yolk sac
bilaminar disk
Fetal Landmark: Within the second week
, composed of hypoblast and epiblast
primitive streak
a groove or a furrow that appears in the epiblast layer of the embryo during the second week of
human development
As the primitive streak forms, it establishes the anterior-posterior axis of the embryo and sets
the stage for the subsequent development of the germ layers
gastrulation
the process in which a gastrula develops from a blastula by the inward migration of cells. Germ
layer formation occurs after this
what kind of cellular division do primordial germ cells undergo?
mitotic
PGC's travel to the developing gonads during the ___ week of development and undergo
_______ , including ________, resulting in _________
fourth
gametogenesis
meiosis
cytodifferentiation
Cytodifferentiation
development of different cell types
Traits of an individual are determined by specific
genes on chromosomes
In humans, there are __ pairs of homologous chromosomes which form a _________ number of
46
23
diploid (2n)
How many pairs of autosomes and how many pairs of sex chromosomes do humans have?
22 pairs of autosomes
verified answers
Gametogenesis
the process of formation and
development of specialized generative cells, gametes
(oocytes/sperms) from bipotential primordial germ cells
Gametogenesis involves what parts of the gametes?
chromosomes and cytoplasm
Human fertilization is
the union of an egg
and sperm occurring primarily in
the ampulla of the fallopian tube
Zygote
fertilized egg
primordial germ cells
Precursor of germ cells, become oocytes or spermatozoa in the adult
when and where do primordial germ cells originate?
in the bilaminar disc (epiblast)
during the second week and
move through the primitive
streak during gastrulation,
migrating to the wall of the
yolk sac
bilaminar disk
Fetal Landmark: Within the second week
, composed of hypoblast and epiblast
primitive streak
a groove or a furrow that appears in the epiblast layer of the embryo during the second week of
human development
As the primitive streak forms, it establishes the anterior-posterior axis of the embryo and sets
the stage for the subsequent development of the germ layers
gastrulation
the process in which a gastrula develops from a blastula by the inward migration of cells. Germ
layer formation occurs after this
what kind of cellular division do primordial germ cells undergo?
mitotic
PGC's travel to the developing gonads during the ___ week of development and undergo
_______ , including ________, resulting in _________
fourth
gametogenesis
meiosis
cytodifferentiation
Cytodifferentiation
development of different cell types
Traits of an individual are determined by specific
genes on chromosomes
In humans, there are __ pairs of homologous chromosomes which form a _________ number of
46
23
diploid (2n)
How many pairs of autosomes and how many pairs of sex chromosomes do humans have?
22 pairs of autosomes
