Following statements are regarding to the establishment of ventral axis in Drosophila.

A. Ventral follicle cells synthesize Pipe. Pipe signal sulfates ventral vitelline proteins.

B. GD cleaves Snake to its active form and forms a complex with Snake and uncleaved Easter proteins.

C. Sulfated vitelline membrane proteins bind Gastrulation-defective (GD).

D. Easter protein is cleaved into its active form. Cleaved Easter binds to and cleaves Spätzle; activated Spätzle binds to Toll receptor protein.

E. Dorsal protein enters the nucleus and ventralizes the cell.

F. Toll activation activates Tube and Pelle, which phosphorylate the Cactus protein. Cactus is degraded, releasing it from Dorsal.

Which of the following is the correct sequence?

TLS Online TPP Program

#Question id: 5106

#Unit 5. Developmental Biology

Given below are fate map of four organism and the pattern by which embryo undergo cleavage. Which of the following is right Combination?

TLS Online TPP Program

#Question id: 5108

#Unit 5. Developmental Biology

The absence of limbs in snakes may be attributable to the evolution of changes in:

TLS Online TPP Program

#Question id: 5109

#Unit 5. Developmental Biology

In drosophila, the stem cells for sperm reside in a regulatory microenvironment called

TLS Online TPP Program

#Question id: 5111

#Unit 5. Developmental Biology

Once the germ layers are established, the cells interact with one another and rearrange themselves to produce tissues and organs. This process is called:

TLS Online TPP Program

#Question id: 5112

#Unit 5. Developmental Biology

Inward movement of an expanding outer layer spreading over the internal surface during gastrulation is termed as

TLS Online TPP Program

#Question id: 5113

#Unit 5. Developmental Biology

The adult stem cell is housed in and controlled by its own adult stem cell niche. Which one of the following process not occur in niche?