<prompt> A 20-year-old female presents for an infertility workup. She has never had a menstrual period. She is short with a broad chest, webbed neck, and low-set ears. It is demonstrated that she has an abnormal karyotype.The cause of the womans abnormal karyotype is which one of the following?Maternal nondisjunctionPaternal nondisjunctionBoth maternal and paternal nondisjunctionEither maternal or paternal nondisjunction  <response>: Monosomy X Turner syndrome can be as a result of either maternal nondisjunction an egg is created lacking an X chromosome, whereas another egg has two X chromosomes or paternal nondisjunction a sperm lacks the X chromosome, whereas another sperm contains both the X and Y chromosomes. Turner syndrome is not caused by translocation events, either reciprocal or Robertsonian recall that Robertsonian translocations only occur among acrocentric chromosomes, and the X chromosome if not acrocentric. 