Question

Vitellogenesis vs previtellogenesis

Answer 1

Vitellogenesis  (also known as yolk deposition) is the process of yolk formation via nutrients being deposited in the oocyte, or female germ cell involved in reproduction of lecithotrophic organisms. In insects, it starts when the fat body stimulates the release of juvenile hormones and produces vitellogenin protein.

Previtellogenesis is characterised by an intensive synthesis of rRNA and by the changing of organization in the cytoplasm morphology. There is an increase in the quantity of endoplasmic reticulum (especially RER), mitochondria and Golgi complexes.