What is the difference between spermatogenesis and oogenesis

Ratul Santra 24th Sep, All stages of spermatogenesis completed in testes. It is a continuous process. Oogenesis 1. It is a discontinued process.

This is the basic difference between Spermatogenesis and Oogenesis. Share Facebook Copy Link. More Report. Delete Answer. Are you sure you want to delete your answer? Yes No. Comments 0. Question cannot be greater than characters.

Saurabh Khade 24th Sep, Hello Aspirant, Oogenesis is the process of formation of mature secondary oocytes , spermatogenesis is the formation of sperms mature male germ cells. Related Questions.

Oogonia produce primary oocytes by mitosis during the early embryonic developmental stages. After puberty, these primary oocytes start to convert to secondary oocytes, which are haploid, during meiosis I. Then during meiosis II, secondary oocyte converts to the ovum, which is also haploid. During both meiosis I and II, the cytoplasm divides unequally, producing two unequal sized cells. The larger cell becomes the ovum while the smaller one becomes the polar body. The secondary oocyte is released from the ovary at ovulation.

Spermatogenesis is the formation of sperms male gametes. It occurs in male testes. In contrast, oogenesis is the formation of egg cells or ova female gametes. It occurs in ovaries. Spermatogenesis starts from a primary spermatocyte and produces four functional spermatozoa whereas oogenesis starts from a primary oocyte and produces a single ovum. The size of the cells they produce is also another difference between spermatogenesis and oogenesis; sperms are smaller in size whereas ovum is a big cell.

Moreover, sperms are motile while ovum is immotile. Cytogenesis in spermatogenesis results in two equal cells while cytogenesis in oogenesis results in two highly unequal cells. The spermatogonium is a diploid cell containing 2n chromosomes. The spermatogonium divides into four, haploid n spermatozoa. Spermatogonium arises from spermatogenic germs cells. These germ cells are stem cells that have the capability of self-renewing.

Differentiation of spermatogenic germ cells results in the formation of intermediate spermatogonium, which further undergoes mitosis to produce type B spermatogonia. These type B spermatogonia further undergo mitosis to produce primary spermatocytes. The primary spermatocytes undergo meiosis I to produce secondary spermatocytes. The secondary spermatocytes then undergo meiosis II and produce four haploid spermatids. These spermatids finally undergo spermiogenesis to produce the sperm tail.

Spermatogenesis commences when the males attain puberty and continue for the rest of their lives. Millions of sperms are produced in the process every day.

Spermatic development takes place about 70 days in humans. How Are Eggs Produced? Eggs are produced in the ovary of females by a process called oogenesis. It is produced from the oogonia present in the ovary.

The egg or the ovum is produced from the diploid primary oocyte by meiosis. Two polar bodies are also formed during meiosis I and II. Unlike spermatogenesis that occurs every day, oogenesis occurs once in a month, starting from puberty and ending at menopause. Similar to spermatogonia, the first female reproductive cell is the oogonia, which is a stem cell.

Therefore oogonia have the ability of self-renewal and self-differentiation. Thousands of oogonia divide into around seven million germ cells from the second to the seventh month of embryonic development. The oogonia divide by mitosis to produce the primary oocyte. These primary oocytes undergo meiotic division till the diplotene stage in the embryonic stage, after which it stalls the process of cell division and attains a quiescent stage.

The cell division process is arrested until the girl attains puberty. Some primary oocytes have also been found. Most primary oocytes are destroyed, and around primary oocytes divide into gametes.

Upon attaining puberty, the arrestation on the cell division process is lifted, the process continues, and primary oocytes divide into secondary oocytes.

However, this division is unequal, and one secondary oocyte and one polar body are formed from a primary oocyte. The cytoplasm is contained in the secondary oocytes, while the nucleus in the polar body is destroyed. During ovulation, these secondary oocytes are released from the ovary. Spermatogenesis and oogenesis, although taking place in two different individuals, has certain similarities and dissimilarities.

The difference between spermatogenesis and oogenesis are as follows. Production of sperm from spermatogonia. Production of an ovum from oogonia. Testis in males.