Some are eaten up by immune cells in the uterus, because sperm are foreign." Up to 70% of sperm don't even make it past the ...

The first mice to be created from two fathers, a phenomenon known as androgenesis, have now produced healthy offspring for ...

Sperm cells are known to prefer cooler temperatures. For quite some time, a puzzling question for scientists has been: how do temperature-sensitive swimmers actually operate effectively within the ...

She described the sperm protein bundle as a kind of key, which fits with a lock on an egg cell. In fish, that lock is a protein named Bouncer — appropriately, as the sperm head can’t enter the ...

In the future, it could be joined by IVG, in vitro gametogenesis, a new process that could turn any cell first into a stem cell and then into a sperm or egg cell. Lluis Gene/AFP via Getty Images ...

Fertilization occurs when a sperm cell penetrates an egg and combines with the 23 chromosomes the egg contains. That forms a single cell of 46 chromosomes . If all goes well, a baby will be born 9 ...

A skin cell taken from a 50-year-old is going to have many more mutations than a typical egg or sperm cell from a 30-year-old. We don’t know if or how these might affect an embryo, or a baby.

Sperm cells are attracted towards the egg Sperm may smell their way to the egg, which researchers say could lead to advances in contraception and fertility treatments. German researchers trying to ...

There are huge gaps in what we know about sperm, from how they navigate to why sperm counts are tumbling. The BBC unravels why we know so little about this perplexing cell.

DNA is marked in blue, showing in the egg at the top and in a sperm cell at the bottom left. (Yonggang Lu/Osaka University/IMP via AP) How a sperm and an egg fuse together has long been a mystery.

DNA is marked in blue, showing in the egg at the top and in a sperm cell at the bottom left. (Yonggang Lu/Osaka University/IMP via AP) How a sperm and an egg fuse together has long been a mystery.