<prompt> A married middle aged female gives history of repeated abortions for the past 5 years. Which of the following chromosomal anomaly is the most common cause for this?Klinefelters syndromeTurners syndromeDowns syndromePataus syndrome  <response>: The given karyogram shows three chromosomes at 21 instead of a pair. It is called Trisomy 21. Trisomy 21 is synonymous with Downs syndrome and is the most common of the chromosomal disorders. It is a major cause of mental retardation. Other trisomies are Edward syndrome Trisomy 18 and Patau syndrome Trisomy 13 