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Developmental Biology
LE1 ( Updated
2025 ) 1-60 Complete
Questions &
Answers (Solved) 100% Correct
In cases when insufficient mesoderm is formed in the
caudal-most region of the embryo as due to the absence of
Brachury T gene products would result to a condition of:
Caudal dysgenesis
Sacrococcygeal teratoma
Spina bifida
Anencephaly - ANSWER-Caudal dysgenesis
Dorsal axis formation is naturally inhibited by:
BMP4
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TGF-beta Superfamily
BMP7
Goosecoid/ Nodal - ANSWER-BMP4
Which statement is true of neurula?
I. Neural tube separates from the epidermis and drop
below surface
II. Formation of neural tube is due to inductive influence
of the chordamesoderm and/ or notochordal plate
III. Neural tube is derived from the ectoderm
IV. Microtubules play a role in neurulation
V. During neurulation, mesodermal layer on either side of
notochord splits in longitudinal divisions
II, III, IV, V only
I, II, IV, V only
I, III, IV, V only
I, II, III, IV, V are all TRUE
III, IV, V only - ANSWER-I, II, IV, V only
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The cortical reaction functions directly in the:
Generation of nerve-like impulse in the egg
Formation of fertilization membrane
The fusion of male and female pronuclei
Release of hydrolytic enzymes by the sperm -
ANSWERFormation of fertilization membrane
Identify the Law/ Theory being described herewith:
"... in the early oocyte, there does not exist a miniature
being but only the materials of which the embryo is
built..."
Von Baer's Law
Biogenesis
Recapitulation
Preformation
Epigenesis - ANSWER-Epigenesis
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in the expression of critical morphoregulatory molecules
such as the CAMs and SAMs, the stage-specific events of
______ would be most largely affected.
Gastrulation
Neurulation
Late cleavage
Blastulation
Pattern formation - ANSWER-Gastrulation
Spreading of a sheet of embryonic cells with
accompanying interdigitation and intercalation is:
Convergent extension
Epiboly
Delamination
Ingression
Involution - ANSWER-Convergent extension
During cleavage
Developmental Biology
LE1 ( Updated
2025 ) 1-60 Complete
Questions &
Answers (Solved) 100% Correct
In cases when insufficient mesoderm is formed in the
caudal-most region of the embryo as due to the absence of
Brachury T gene products would result to a condition of:
Caudal dysgenesis
Sacrococcygeal teratoma
Spina bifida
Anencephaly - ANSWER-Caudal dysgenesis
Dorsal axis formation is naturally inhibited by:
BMP4
,2 | Page
TGF-beta Superfamily
BMP7
Goosecoid/ Nodal - ANSWER-BMP4
Which statement is true of neurula?
I. Neural tube separates from the epidermis and drop
below surface
II. Formation of neural tube is due to inductive influence
of the chordamesoderm and/ or notochordal plate
III. Neural tube is derived from the ectoderm
IV. Microtubules play a role in neurulation
V. During neurulation, mesodermal layer on either side of
notochord splits in longitudinal divisions
II, III, IV, V only
I, II, IV, V only
I, III, IV, V only
I, II, III, IV, V are all TRUE
III, IV, V only - ANSWER-I, II, IV, V only
,3 | Page
The cortical reaction functions directly in the:
Generation of nerve-like impulse in the egg
Formation of fertilization membrane
The fusion of male and female pronuclei
Release of hydrolytic enzymes by the sperm -
ANSWERFormation of fertilization membrane
Identify the Law/ Theory being described herewith:
"... in the early oocyte, there does not exist a miniature
being but only the materials of which the embryo is
built..."
Von Baer's Law
Biogenesis
Recapitulation
Preformation
Epigenesis - ANSWER-Epigenesis
, 4 | Page
in the expression of critical morphoregulatory molecules
such as the CAMs and SAMs, the stage-specific events of
______ would be most largely affected.
Gastrulation
Neurulation
Late cleavage
Blastulation
Pattern formation - ANSWER-Gastrulation
Spreading of a sheet of embryonic cells with
accompanying interdigitation and intercalation is:
Convergent extension
Epiboly
Delamination
Ingression
Involution - ANSWER-Convergent extension
During cleavage
