During oogenesis, the female gamete forms a new non-cellular membrane around itself just prior to ovulation. Identify the specific developmental stage of the gamete that forms this layer, along with the correct name of the layer.

Step-by-step solution

According to NCERT, during the later stages of oogenesis within the tertiary follicle, the primary oocyte completes its first meiotic division to form a large secondary oocyte and a tiny first polar body. The tertiary follicle changes into the mature Graafian follicle. At this stage, the secondary oocyte forms a new non-cellular membrane called the zona pellucida surrounding it. Following this, the Graafian follicle ruptures to release the secondary oocyte during ovulation. Therefore, it is the secondary oocyte sta