Primary and secondary oocytes
Oogenesis is the process of formation of ovum in the female reproductive system.Cell involved in division
Primary oocytes are formed from the oogonia by the mitotic division. Secondary oocytes are formed from the primary oocytes by first meiotic division.Period of development
Primary oocytes are formed during the embryonic development and the secondary oocytes are developed during puberty.Number of chromosomes present
Primary oocytes contain 46 chromosomes. Secondary oocytes contain 23 chromosomes.Ploidy
Primary oocytes are diploid (2n) and secondary oocytes are haploid (n).Summary
CriteriaPrimary oocyteSecondary oocyteCells involved in division OogoniaPrimary oocytePeriod of development Develops during embryonic stageDevelops during pubertNumber of chromosomes present 4623Ploidy 2n n