What type of division do spermatogonia go through?

During spermatocytogenesis primitive cells called spermatogonia proliferate by mitosis. Several different types of spermatogonia have been identified (A-0 through A-4, intermediate [IN], and B).

What cellular process produces spermatogonia?

spermatogenesis, the origin and development of the sperm cells within the male reproductive organs, the testes. The testes are composed of numerous thin tightly coiled tubules known as the seminiferous tubules; the sperm cells are produced within the walls of the tubules.

Does spermatogonia undergo meiotic division?

After birth, the male germ cells, or spermatogonia, resume mitotic proliferation and, with sexual maturity, cells are stimulated to undergo meiotic division. Sperm production is maintained throughout the lifetime of the male.

What are the 3 steps involved in spermatogenesis?

Spermatogenesis can be divided into three phases: (1) proliferation and differentiation of spermatogonia, (2) meiosis, and (3) spermiogenesis, a complex process that transforms round spermatids after meiosis into a complex structure called the spermatozoon.

What happens to type A spermatogonia?

Spermatogonia undergo spermatogenesis to form mature spermatozoa in the seminiferous tubules of the testis. There are three subtypes of spermatogonia in humans: Type A (dark) cells, with dark nuclei. These cells are reserve spermatogonial stem cells which do not usually undergo active mitosis.

What is the function of spermatogonia A?

These reserve male germ cells are called spermatogonia (sg.: spermatogonium). They represent the foundation of sperm cell production in the testis by balancing self-renewal and differentiation activity. When a man reaches the age of puberty, spermatogonia resume their division and start the process of spermatogenesis.

When spermatogonia divide the daughter cells are called?

Spermatogonia divide by mitosis and one daughter cell becomes another spermatogonium and one becomes what’s called a PRIMARY SPERMATOCYTE. This cell is now more specialized than the spermatogonium. It is a diploid cell (2n). Primary spermatocytes grow for a while and then undergo meiosis.

How are the primary spermatocytes produced?

Because they are produced by mitosis, primary spermatocytes, like spermatogonia, are diploid and have 46 chromosomes. Each primary spermatocytes goes through the first meiotic division, meiosis I, to produce two secondary spermatocytes, each with 23 chromosomes (haploid).

Do spermatocytes undergo mitosis?

Spermatocytes are the only cells in males those undergo meiosis, a specialized cell division process characterized by a single round of DNA replication followed by two rounds of chromosome segregation. These divisions produce four haploid spermatids from a single primary spermatocyte (Fig. 2).

What are spermatogonia?

A spermatogonium (plural: spermatogonia) is an undifferentiated male germ cell. Spermatogonia undergo spermatogenesis to form mature spermatozoa in the seminiferous tubules of the testis.

How does spermatogonia become primary spermatocyte?

Spermatogenesis begins with a diploid spermatogonium in the seminiferous tubules, which divides mitotically to produce two diploid primary spermatocytes. The primary spermatocyte then undergoes meiosis I to produce two haploid secondary spermatocytes.