list the varios steps that lead to the formation of egg of hen - Science - Reproduction in Animals

Question

list the varios steps that lead to the formation of egg of
hen

Mushtaq Ahmed · Accepted Answer

Oogenesis

The ovum is
formed by the process of oogenesis

It starts
during embryonic growth and millions of gamete mother cells
(oogonia) are
formed in the foetal ovary

These cells
undergo meiosis, but get temporarily arrested at the prophase and
are called primary
oocytes

Before
reaching puberty, a large number of primary oocytes degenerate and
the remaining ones get surrounded by layers of granulosa cells and
new theca and are called secondary
follicles

The secondary
follicles are then converted into tertiary
follicles that have characteristic fluid-filled cavity
called antrum At this stage, the primary oocyte present within the
tertiary follicle completes meiosis, which results in the formation
of haploid secondary oocyte and a tiny polar body

This tertiary
follicle further changes into the Graafian
follicle The secondary oocyte is surrounded by the zone
pellucida

Then the
Graafian follicle ruptures to release the ovum by ovulation