at which stage of cell division does vitellogenesis starts?

Question

options are:
1]Leptotene
2]Zygotene
3]pecytene
3]diplotene
4]diakinesis
or is it any other stage ?
could u plz give me some information on this with some reference ?

Answer 1

3] Diplotene.

Even so, vitellogenesis occurs in only part of the diplotene, and the signal for the breakdown of the nucleus (the germinal vesicle) occurs after vitellogenesis is completed.

Answer 2

Vitellogenesis occurs when the oocyte reaches the
diplotene stage of meiotic prophase.


The diplotene:The bivalents separate again. During this process it emerges that each chromosome is built of two chromatids, so that the whole complex harbours four strands during the separation. Normally the separation is not accomplished, but the homologous chromosomes stick together at certain points, the chiasmata (sing. chiasma). This state is marked by the formation of cross-like structures, single or multiple loops.



Yolk is formed in one of two ways: It is either synthesized within the oocyte (autosynthesis) or exogenously and transported into the oocyte (heterosynthesis). Vertebrate vitellogenesis is predominantly heterosynthetic. The yolk precursor (vitellogenin), which is synthesized in the liver, is incorporated via receptor-mediated endocytosis