#Question id: 7189
#Unit 5. Developmental Biology
Following statements were made regarding vulval development in C. elegans:
A. The formation of the anchor cell is mediated by lin-12, the C. elegans homologue of the Notch gene.
B. The formation of the anchor cell is mediated by lin-12, the C. elegans homologue of the Delta gene.
C. The lin-12 gene needs to function only in that cell destined to become the uterine precursor cell.
D. Presumptive Anchor cell also need lin-12.
E. Two cells originally synthesize both the signal for uterine differentiation (the LAG-2 protein, homologous to Delta) and the receptor for this molecule (the LIN-12 protein, homologous to Notch.
Which one of the following options represents a combination of correct statements?
#Question id: 7190
#Unit 5. Developmental Biology
In
amphibia, few mutants (Column A) and their affected event or organ (Column B).
|
Column A |
Column B |
|
I.
mRNA of cadherin is destroyed by antisense oligonucleotides |
a.
Epiboly |
|
II.
Loss of methylation on H3K4 |
b.
Convergent extension |
|
III.
Loss of function of tbxt gene |
c.
Blastocoel |
|
IV.
Knockdown of C3a with antisense morpholinos |
d.
MBT |
|
V.
Inhibition of PCP pathway |
e.
Notochord |
Which of the following is correct?
#Question id: 7191
#Unit 5. Developmental Biology
In tunicate embryo, Presumptive endoderm originates from the vegetal A4.1 and B4.1 blastomeres. The specification of these cells coincides with the localization of β-catenin. Which of the following statement is incorrect?
#Question id: 7192
#Unit 5. Developmental Biology
The following are statements regarding the development and maintenance of anterior and posterior compartments in each segment of Drosophila. Which of the following is correct?
#Question id: 7193
#Unit 5. Developmental Biology
Some statements with respect to the regeneration in hydra.
A. The major head inducer of the hypostome organizer is a set of Wnt proteins acting through the canonical B-catenin pathway.
B. The major head inducer of the hypostome organizer is a set of Wnt proteins acting through the noncanonical B-catenin pathway.
C. These Wnt proteins are seen in the apical end of the early bud, defining the hypostome region as the bud elongates
D. If the Wnt signaling inhibitor GSK3 is itself inhibited throughout the body axis, ectopic tentacles form at all levels, and each piece of the trunk has the ability to stimulate the outgrowth of new buds.
E. transgenic hydra made to globally misexpress the downstream Wnt effector ectopic tentacles form at all levels, and each piece of the trunk has the ability to stimulate the outgrowth of new buds.
Which of the following statements are incorrect?
#Question id: 7194
#Unit 5. Developmental Biology
Formation
of digits and sculpting the tetrapod limb requires death of specific cells in
the limb in a programmed manner. Which one of the following interactions could
explain proper limb formation?