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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.This is not the same as sexual reproduction, but it also results in the 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.In many wrasse the opposite is true—most fish are female at birth and become male when they reach a certain size.Sequential hermaphrodites may produce both types of gametes over the course of their lifetime, but at any given point they are either female or male. Ferns which grow in soil which has previously supported hermaphrodites are influenced by hormones remaining to develop as male.It usually needs two individuals which are different sexes from the same species. A man's sperm contains either an X or a Y chromosome.It works by combining genes from more than one source. When a sperm and ova combine to form a fertilised egg, the baby may get either of these chromosomes from its father.

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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.

Sex can be determined in different ways: Usually, sex is determined by an organism's genes.

With genetic sex determination, most alleles or genes that influence sexual development are on the same chromosome. Because genetic sex determination is controlled by a pair of sex chromosomes (or by the presence or absence of one of the chromosomes), there are usually the same number of male and female offspring.

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