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In humans, males and females usually look different.In many species they do not, except for the sex organs.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.Once it is in, a fast reaction goes through the egg cell wall to shut off all other sperm.

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.If the baby gets two X chromosomes, it will develop into a female.If the baby gets one X and one Y, it will develop into a male.Many reptiles have temperature-dependent sex determination: the temperature embryos experience during their development determines the sex of the organism.In some turtles, for example, males are produced at lower incubation temperatures than females; this difference in critical temperatures can be as little as 1-2 °C.