Egg cells are formed by meiosis of oogonia, and the specific process is as follows:

After prophase chromosome replication, the oogonium enters the first meiotic division, and the homologous chromosomes are separated into 1 secondary oocytes and a collective, one big and one small.

Entering the second meiosis, similar to mitosis, centromere separates into four cells. The big one divided by the secondary oocyte is an egg, and the small one and the other group are divided into two groups to form three groups, each of which contains half of the chromosome number of somatic cells.

Egg cells (eggs, eggs) are the reproductive cells of female organisms. Both animals and seed plants produce egg cells. In higher organisms, egg cells are produced by ovaries.

When human eggs mature, they will expel eggs. Once combined with male sperm, it is possible to form fertilized eggs, form embryos and develop.