<prompt> Chromosomal non-disjunction responsible for all exceptDowns syndromeNeurofibromatosis type 1Pradderwilli syndromeAngleman syndrome  <response>: Answer- B. Neurofibromatosis type 1MonosomyTurner syndrome 45XOAutosomal trisomyDowns syndrome- Trisomy 2lEdwards syndrome- Trisomy 18Patau syndrome- Trisomy 13Sexchromosome aneuploidyKleinfelter syndromeXYY maleUniparentral disomyPradder willi angleman syndromeMosiacismPallister killian syndromeHypomelanosis of ito 