Sperm is made in the male testes through a process called spermatogenesis, which develops immature cells called spermatogonia into fully mature sperm cells called spermatozoa. This begins in the seminiferous tubules, where the spermatogonia undergo division in a process called mitosis. In the last stage of maturation, called spermiogenesis, the sperm cell elongates, grows a tail and rotates so that its tail faces inside the tube.Know More
In the process of maturation, the head of the sperm develops a cap called the acrosome, which helps it break down the wall of the female egg during fertilization. The tail propels the sperm using an undulating motion. Once the sperm is fully mature, it travels through the seminiferous tubules and is stored in the epididymis of the testes until it leaves the body during ejaculation.
From the beginning of the process until the end, it takes about 70 days to make sperm. Boys begin to produce sperm when they go through puberty. Sperm is continually produced in males, unlike women who ovulate only once per month. In human males with normal reproductive systems, every ejaculation contains approximately 200 to 300 million sperm. In addition to sperm, ejaculated semen contains a number of other liquids, including secretions from the seminal vesicles, Cowper's gland and prostate gland.Learn more about Molecular Biology & DNA
The main purpose of mitosis is to promote growth and facilitate cell repair while the primary role of meiosis is to produce gametes, which include sperm and eggs. Mitosis and meiosis are both involved in the process of reproduction: these biological functions involve cell division and replication, but perform their tasks in different ways.Full Answer >
The sides of the DNA ladder are made up of a combination of alternating sugars and phosphates. These molecules are what holds the rungs of DNA together on the ladder.Full Answer >
Chromosomes are made of a protein surrounded by a double-stranded nucleic acid called DNA. DNA contains genetic information that provides instructions to the cells for carrying out bodily functions.Full Answer >
Corn, also commonly known as "maize," is made up of 10 chromosomes. These chromosomes contain approximately 32,000 genes, compared to just 20,000 genes in human DNA.Full Answer >