28

Why are we female and/or male?

0

For fertilization to occur, the sperm must find the egg within one day.

0

About the function of the mammalian sperm cell.

12

Mating is the most fundamental and vital process for animals to select for their best partners. In the view of biology, mating refers to the pairing of opposite-sex for copulation (the union of the sex organs of two sexually reproducing animals for insemination and subsequent internal fertilization) in social animal to breed for their offspring.

0

Research is currently ongoing all over the world about a new technology that would allow eggs and sperm to be grown from human skin. This could mean hope for many couples who can’t have children.

25

This is how the sperm meets an egg until it is fertilized as a healthy fetus in the mother’s womb.

0

An introduction to the cloning procedure.

6

Explains the journey of the sperm and the egg.