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WorksheetsFertilisation, Cleavage and Gastrulation
Total questions: 20
Worksheet time: 20mins
As an embryo develops, new cells are produced as the result of
differentiation
preformation
cell division.
morphogenesis
epigenesis.
Contact of a sperm with signal molecules in the coat of an egg causes the sperm to undergo
mitosis
depolarization
apoptosis
the acrosomal reaction
Contact of an egg with signal molecules on sperm causes the egg to undergo a brief
mitosis.
membrane depolarization
apoptosis.
the acrosomal reaction
During fertilization, the acrosomal contents
block polyspermy
help propel more sperm toward the egg
digest the protective coat on the surface of the egg
nourish the mitochondria of the sperm.
trigger the completion of meiosis by the sperm
From earliest to latest, the overall sequence of early development proceeds as follows
gastrulation → organogenesis → cleavage
ovulation → gastrulation → fertilization
cleavage → gastrulation → organogenesis
gastrulation → blastulation → neurulation
preformation → morphogenesis → neurulation
From earliest to latest, the overall sequence of early development proceeds as follows
first cell division → synthesis of embryoʹs DNA begins → acrosomal reaction → cortical reaction
cortical reaction → synthesis of embryoʹs DNA begins → acrosomal reaction → first cell division
cortical reaction → acrosomal reaction → first cell division → synthesis of embryoʹs DNA begins
first cell division → synthesis of embryoʹs DNA begins → acrosomal reaction → cortical reaction
acrosomal reaction → cortical reaction → synthesis of embryoʹs DNA begins → first cell division
The cortical reaction functions directly in the
formation of a fertilization envelope.
production of a fast block to polyspermy
release of hydrolytic enzymes from the sperm cell.
fusion of egg and sperm nuclei
The ʺslow blockʺ to polyspermy is due to
a transient voltage change across the membrane.
the jelly coat blocking sperm penetration
formation of the fertilization envelope.
inactivation of the sperm acrosome
Fertilization normally
reinstates diploidy.
follows gastrulation.
is required for parthenogenesis.
merges two diploid cells into one haploid cell
precedes ovulation
In mammalian eggs, the receptors for sperm are found in the
fertilization membrane.
zona pellucida.
cytosol of the egg
nucleus of the egg.
As cleavage continues during frog development, the size of the blastomeres
increases as the number of the blastomeres decreases
increases as the number of the blastomeres increases
decreases as the number of the blastomeres increases
decreases as the number of the blastomeres decreases
increases as the number of the blastomeres stays the same
The sequence of developmental milestones proceeds as follows:
cleavage → blastula → gastrula → morula
cleavage → gastrula → morula → blastula
cleavage → morula → blastula → gastrula
gastrula → morula → blastula → cleavage
morula → cleavage → gastrula → blastula
Cells move to new positions as an embryo establishes its three germ tissue layers during
cleavage
fertilization
induction.
gastrulation
entah,saya pun tak tahu
If gastrulation was blocked by an environmental toxin, then
cleavage would not occur in the zygote
embryonic germ layers would not form
the blastula would not be formed
fertilization would be blocked.
embryo akan jadi Superman
The earliest developmental/ embryogenesis stage among these choices is
germ layers
morula.
blastopore.
gastrulation
Batman
A correct statement is
The mesoderm gives rise to the notochord
The endoderm gives rise to the hair follicles
The ectoderm gives rise to the liver.
The mesoderm gives rise to the lungs
The ectoderm gives rise to the liver.
At the time of implantation, the human embryo is called a
blastocyst
gastrula
fetus
zygote
Lupa leh
Uterine implantation due to enzymatic digestion of the endometrium is initiated by
the inner cell mass.
the endoderm.
the chorion.
the mesoderm
the trophoblast.
Gases are exchanged in a mammalian embryo in the
amnion.
hypoblast
chorion.
trophoblast
yolk sac.
The cortical reaction of sea urchin eggs functions directly in the
formation of a fertilization envelope
production of a fast block to polyspermy
release of hydrolytic enzymes from the sperm
fusion of egg and sperm nuclei
