Initiaion of first meiotic division starts before birthin Primary oocytes. They enter prophase of meiosis I but do not complete that until after puberty. During this arrested stage of development, each primary oocyte is surrounded by a single layer of flat follicular cells, and the entire structure is termed as Primordial follicle.
At puberty, a few primary oocytes complete meiosis I and produce a secondary oocyte and first polar body. The secondary oocyte has half the number of chromosomes (haploid set). The released polar body may or may not divide again.
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