<prompt> Which of these syndromes is associated with microcephaly?Down syndromeEdward syndromeCri-du-chat syndromeAll of these  <response>: Ans. D. All of theseMicrocephaly or small head is subdivided into primary and secondary microcephaly. Primary microcephaly usually follows a Mendelian pattern of inheritance or is associated with certain syndromes. Down syndrome trisomy 21, Edward syndrome trisomy 18, Cri-du-chat syndrome 5p-, and Cornelia de Lange syndrome are associated with microcephaly. 