Which of the following is the precursor of yolk?

Correct option is B

→ Vitellogenin is the main precursor molecule used to produce yolk proteins in developing oocytes.
→ Synthesized in the liver under estrogen stimulation.
→ Transported via blood to ovaries where it is taken up by oocytes.
Information Booster:
→ Essential for oocyte growth (vitellogenesis).
→ Widely used as a biomarker for endocrine disruption in aquatic toxicology.
→ Ensures nutrient availability for embryo development.
Additional Information (Other Options):
(a) Oestrogen: Stimulates vitellogenin production.
(c) Progesterone: Involved in final maturation, not yolk formation.
(d) Clathrin: Helps in vesicle formation during vitellogenin uptake, not a precursor.