Primary oocyte is formed after
First meiotic division
Second meiotic division
Mitotic division
None of the above
In the female, the primordial germ cells (oogonia) continue to proliferate by mitosis, reaching a peak of 5-7 million by 20 weeks of gestation. However, only some enter meiosis and become primary oocytes, arresting in diplotene of the first meiotic prophase, and become surrounded by a single layer of flattened pregranulosa cells, forming primordial follicles.Ref: Clinical endocrinology and infeility; 8th edition; Chapter 3; The Ovary--Embryology and Development
Endocrinology