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Biology LibreTexts

8.5: Cytogenetics – Terms and Concepts

  • Page ID
    24175
  • Karyotype A picture of an individual’s chromosomes in which the chromosomes are paired and arranged in order of decreasing size.
    Monosomy The lack of one of a pair of chromosomes. A common monosomy is X chromosome monosomy, known in humans as Turner syndrome and denoted as 45, X.
    Trisomy Condition of having three chromosomes of a particular type. A common trisomy in humans is Down syndrome, or trisomy A male with trisomy 21 is denoted as 47, XY, 21+.
    Nondisjunction

    Failure of chromosome pairs to separate during meiosis I or meiosis II.