Extra sex chromosone

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Back to Health A to Z.Males usually have one X and one Y chromosome, and females usually have two X chromosomes.Sex chromosome abnormalities may be caused by full or partial deletions or duplications of sex chromosomes.Sex chromosome aneuploidies individuals with abnormal numbers of sex chromosomes are found not infrequently in the general population and have characteristic deficits of cognitive ability: Individuals with an extra X chromosome XXY or Klinefelter's syndrome, and XXX syndrome have delays in the acquisition of language, as also do individuals with XYY syndrome.Sex chromosome abnormalities occur as a result of chromosome mutations brought on by mutagens like radiation or problems that occur during meiosis.

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Humans are born with 46 chromosomes in 23 pairs.

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Disorders of the sex chromosome like disorders of the autosomes can be either numerical or structural, and can be present in all cells or in a mosaic form.Klinefelter syndrome is a chromosomal condition in boys and men that can affect physical and intellectual development.Sex Chromosome Abnormalities.

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