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Developmental Biology LE1( Updated 2026/2027)
Complete Questions With 100% Verified
Solutions
Which of the following DOES NOT occur during
cleavage?
Nuclear:cytoplasmic ratio of cell increases
None of the choices
Embryo grows significantly in mass
Addition of the new gap phases to the cell cycle
Increase of the copies of the genome - ANSWERAddition
of the new gap phases to the cell cycle
A default in the spatio-temporal expression of this gene
(that codes for a transcription factor) likewise could lead
to the default in the expression of genes that
regulate/block the activity of the bone morphogenetic
protein (BMP4)
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Beta-catenin
Noggin and chordin
TGF beta Superfamily and Sonic hedgehog
Goosecoid gene/nodal gene
Siamois+ and twin+ - ANSWER-Goosecoid gene/nodal
gene
Copies of the embryonic genome increases during:
Cleavage stage
Body axes formation
Neurula stage
Blastula stage
Gastrula stage - ANSWER-Cleavage stage
The agent of ventral specification of the neural tube,
probably originating from the notochord is the:
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No answer text provided
Sonic hedgehog
Chordin and noggin
BMP4 protein
Activin, TGF beta Superfamily
Nodal - ANSWER-BMP4 protein
If and when BMP4 was inhibitor-unregulated, axis
establishment may occur by default which is best likely
the:
Ventralization of the mesoderm
Dorsalization of mesoderm
Malformation of head structures
Regionalization of the head structures -
ANSWERVentralization of the mesoderm
The initial dorsal-ventral axis in amphibian embryo is
determined by:
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The amount of yolk
Siamois+ and twin+ genes
Point of sperm entry
Genetic differences in the blastomeres - ANSWER-Point
of sperm entry
The pairing of homologous chromosomes takes place
during:
Diplotene
Diakinesis
Developmental Biology LE1( Updated 2026/2027)
Complete Questions With 100% Verified
Solutions
Which of the following DOES NOT occur during
cleavage?
Nuclear:cytoplasmic ratio of cell increases
None of the choices
Embryo grows significantly in mass
Addition of the new gap phases to the cell cycle
Increase of the copies of the genome - ANSWERAddition
of the new gap phases to the cell cycle
A default in the spatio-temporal expression of this gene
(that codes for a transcription factor) likewise could lead
to the default in the expression of genes that
regulate/block the activity of the bone morphogenetic
protein (BMP4)
,2 | Page
Beta-catenin
Noggin and chordin
TGF beta Superfamily and Sonic hedgehog
Goosecoid gene/nodal gene
Siamois+ and twin+ - ANSWER-Goosecoid gene/nodal
gene
Copies of the embryonic genome increases during:
Cleavage stage
Body axes formation
Neurula stage
Blastula stage
Gastrula stage - ANSWER-Cleavage stage
The agent of ventral specification of the neural tube,
probably originating from the notochord is the:
,3 | Page
No answer text provided
Sonic hedgehog
Chordin and noggin
BMP4 protein
Activin, TGF beta Superfamily
Nodal - ANSWER-BMP4 protein
If and when BMP4 was inhibitor-unregulated, axis
establishment may occur by default which is best likely
the:
Ventralization of the mesoderm
Dorsalization of mesoderm
Malformation of head structures
Regionalization of the head structures -
ANSWERVentralization of the mesoderm
The initial dorsal-ventral axis in amphibian embryo is
determined by:
, 4 | Page
The amount of yolk
Siamois+ and twin+ genes
Point of sperm entry
Genetic differences in the blastomeres - ANSWER-Point
of sperm entry
The pairing of homologous chromosomes takes place
during:
Diplotene
Diakinesis
