LEONARD LESSIN / SCIENCE PHOTO LIBRARY LEONARD LESSIN / SCIENCE PHOTO LIBRARY
Colour enhanced micrograph of the karyotype of a patient with Turner's syndrome. A karyotype is an arrangement of the set of chromosomes. Turner's syndrome, which only affects women, is an absence of the second sex chromosome. In a healthy woman there would be two X chromosomes instead of one (seen at lower right). The symptoms of Turner's syndrome include stunted growth, retarded sexual development (leading to infertility), and webbing of the skin of the neck. Often heart problems are present too. Turner's syndrome is rare, affecting around one in every 3000 female births.
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