Crack CSIR NET 2021 | Life Science : (Developmental Biology) (17 sept)

C. elegans embryo uses both autonomous and conditional modes of specification. Conditional specification at the 4-cell stage can be seen in the development of the endoderm cell lineage and also in the establishment of dorsal-ventral axis. Following are few statements regarding this:

(A) If the P₂ cell is removed at the early 4-cell stage, the EMS cell will divide into two MS cells and no endoderm will be made.

(B) In pop-1 deficient embryos, both EMS daughter cells become E cells.

(C) When the position of ABa and ABp was reversed, their fates get reversed and no normal embryo forms.

(D) In embryos whose mother have mutant glp-1, ABp is transformed into ABa cell.

Which of the above statements are true?

Membrane-bound, Golgi-derived structures containing proteolytic enzymes in sperms of sea urchin are called

C . elegans is a powerful developmental model because:

Which one of the following statements with respect to amphibian development is correct?

Both TGF-β and Sonic hedgehog signals play important roles ¡n both neurulation and cell-fate patterning of the neural tube. Which one of the following statements is true?