By about 1900 the observations of Hertwig, Fol, and others were brought together to make the now-familiar picture: a single ...

Furthermore, just as happens inside immune cells that target microbes, LAP's final step in the egg involves ... For example, ...

They found that male medaka can mate 19 times per day on average. In the first three mating sessions, the medaka released ...

Fertilization begins when sperm navigate to an egg, guided by chemical signals ... The study has been published in Cell.

It produces the female egg cells, called the ova or oocytes ... If intercourse has taken place and sperm has fertilized the egg (a process called conception), the fertilized egg (embryo) will ...

Two weeks after a human egg is fertilized, primordial germ cells (PGCs), which develop into sperm and eggs, are formed. In six to 10 weeks after fertilization, PGCs differentiate into pro ...

Under ideal conditions, sperm lives for days after ejaculation from intercourse. This article examines sperm motility and how ...

These cells develop into sperm or ova ... In contrast, each egg cell, or ovum, is relatively large and non-motile. During fertilization, a spermatozoon and ovum unite to form a new diploid ...

Once it's mature, the egg is released into the Fallopian tube. The mature egg can then be fertilized by a sperm cell, which creates a zygote — a fertilized egg cell. After fertilization ...

Scientists have grown an entity that closely resembles an early human embryo, without using sperm, eggs or a womb. The Weizmann Institute team say their "embryo model", made using stem cells ...