BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Colour enhanced micrograph of a normal male karyotype; male chromosomes arranged in homologous pairs. Each member of a homologous pair is similar in length and banding pattern. Certain genetic disorders can be identified by detection of abnormal gene products. Each human cell contains 46 chromosomes in total, 23 of maternal and 23 of paternal origin. An extra chromosome signifies a genetic abnormality.
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