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

Sexual reproduction first appeared about a billion years ago. Sexual reproduction is a process that can only be found in eukaryotes. There are other kinds of organisms (other than animals, plants and fungi), the other eukaryotes – such as the malaria parasite – that also engage in sexual reproduction.

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

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.

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