It's commonly thought that sperm "race" to the egg, with the winner fertilizing it. But is this really the case?

In an advance for treating male infertility, researchers transplanted a patient with his own sperm-forming stem cells that ...

Known as the cell’s engine, the mitochondria propels the sperm toward the egg, explained Dr. Houda Amor, a co-author of the study with Dr. Hammadeh. With the mitochondria hobbled, the sperm ...

Sexual reproduction involves the joining of two sex cells or gametes – the sperm (male gamete) and the egg or ovum (female gamete). The male and female reproductive system The male reproductive ...

A man in his early 20s received a transplant of his own sperm-producing stem cells, which had been frozen since his childhood ...

The earliest days after fertilization, once a sperm cell meets an egg, are shrouded in scientific ... for scientists to understand what can go wrong during that process, and how specific risk ...

Daniella Gray is a Newsweek Family & Parenting Reporter based in London, U.K. Her focus is on family dynamics, childhood development, parenting styles, U.S. education and current trends in family ...

A new way to measure male fertility has been discovered by researchers at the University of Waterloo, opening the door to the development of simple, inexpensive tests for clinical and at-home use.

Egg fertilization is often described as an epic swim meet: Millions of sperm swim as fast as they can toward the egg until ...