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Sex is a type of reproduction common among living things. In humans, the sex of a person depends on what sex chromosomes that person got from his or her parents.

Sex is used by plants and animals, and also by fungi and various single-celled organisms. A woman's ovum (egg cell) contains one X chromosome.

This is not the same as sexual reproduction, but it results in a similar mixture of genetic traits.

In sexual reproduction the cells used for reproduction, called gametes, are either eggs or sperms. The mechanism of cell division only works when one sperm alone enters the egg.

Some genetic disorders may produce physical or mental traits which need special treatment. Other conditions may have partly genetic causes: mental retardation, attention-deficit hyperactivity disorder (ADHD), obsessive compulsive disorder (OCD) and schizophrenia.

Before babies are born, they grow either male sex parts or female sex parts.

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This results in an individual having 3 X chromosomes, or 2 Y chromosomes or XXY instead of XY.

In humans, males and females usually look different.

In many species they do not, except for the sex organs.

Once it is in, a fast reaction goes through the egg cell wall to shut off all other sperm.

Sex determination in biology is about the function of sex, not what individuals look like.

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