#Question id: 7282
#Unit 5. Developmental Biology
In humans, neural tube closure defects occur in about 1 in every 1000 live births. Failure to close the neural tube can result from both genetic and environmental causes. A recent report has demonstrated that zinc deficiency disrupts neural tube closure by:
#Question id: 7283
#Unit 5. Developmental Biology
The Drosophila orthodenticle gene and the vertebrate Otx genes are homologous and provide a good example of the conservation of gene function during evolution. Which of the following statement is correct regarding to the expression of gene expression.
#Question id: 7284
#Unit 5. Developmental Biology
Choose
the correct match.
|
Genes |
Axis
polarity |
|
a.Maternal deficiency of gurken
|
i.Posteriorization of follicle cells |
|
b.Maternal deficiency of torpedo
|
ii.Ventralization of embryo |
|
c. Maternal deficiency of toll |
iii.Dorsalization
of embryo |
|
|
iv.No
anterior posterior axis |
#Question id: 7285
#Unit 5. Developmental Biology
During xenopus gastrulation, C3a functions as a short-range chemoattractant to guide the radial intercalation movements of cells. If Knockdown of C3a with antisense morpholinos results:
#Question id: 7286
#Unit 5. Developmental Biology
Which of the floral whorls is affected in apetala 3/pistillata (ap3/pi) mutants?
#Question id: 7287
#Unit 5. Developmental Biology
Following
statements are regarding to the the floral quartet model and the underlying
ABCDE model of organ identity determination in Arabidopsis thaliana.
A.
Five floral organ identities (sepals, petals, stamens, carpels, and ovules) are
specified by the formation of floral organ-specific tetrameric complexes of
MADS-domain transcription factors that bind to two nearby enhancer elements,
forming a DNA loop in between.
B.
A complex of two class A proteins (APETALA 1) and two class E proteins (SEPALLATA) determines petal identity.
C.
A complex of one class A protein, one class E protein, and one of each of the
class B proteins (APETALA 3 and PISTILLATA) determines sepal identity.
D. A complex of one class E protein, two class B proteins, and one class C protein (AGAMOUS) determines stamen identity, while a complex of two class E proteins and two class C proteins determines carpel identity.D. A complex of one class E protein, two class B proteins, and one class C protein (AGAMOUS) determines stamen identity, while a complex of two class E proteins and two class C proteins determines carpel identity.
E.
A complex of one class E protein, one class C protein, and one of each of the
class D proteins (SHATTERPROOF and SEEDSTICK) controls ovule identity.
Which of the following combination are correct?