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Persons whose anatomy or chromosomal makeup differ from this pattern are referred to as intersex.

This is referred to as the XY sex-determination system and is typical of most mammals, but quite a few other sex-determination systems exist, including some that are non-genetic.

Secondary sexual characteristics include everything from the specialized male and female features of the genital tract, to the brilliant plumage of male birds or facial hair of humans, to behavioral features such as courtship.

Biological factors are not sufficient determinants of whether a person considers themselves a man or is considered a man.

More directly, the word derives from Old English mann.

In mammals, the hormones that influence sexual differentiation and development are androgens (mainly testosterone), which stimulate later development of the ovary.

However, the term man is also sometimes used to identify a male human, regardless of age, as in phrases such as "men's basketball".

Like most other male mammals, a man's genome typically inherits an X chromosome from his mother and a Y chromosome from his father.

The term manhood is associated with masculinity and virility, which refer to male qualities and male gender roles.

Humans exhibit sexual dimorphism in many characteristics, many of which have no direct link to reproductive ability, although most of these characteristics do have a role in sexual attraction.

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