The chromosomal karyotype in patau syndrome is: (A) 47XX,+21, (B) 46XX\/47XX,+18, (C) 45XX,der(14;21), (D) 47XX,+13
Answer is D. TRISOMY 13: PATAU SYNDROME Incidence: 1 in 15,000 bihs Karyotypes: Trisomy 13 type: 47,XX, +13 Translocation type: 46,XX,+13,der(13;14)(q10;q10) Mosaic type: 46,XX/47,XX, +13 (Robbins Basic Pathology, 9 th edition. page : 238)