Karyotyping of the foetus may be done from all of the following except -: (A) Lymphocyte, (B) Monocyte, (C) Amniocyte, (D) Fibroblast
Answer is B. Although human chromosome may be visualized (karyotyping) in any growing tissue such as bone marrow, skin, fibroblast, amniotic fluid cells or chorionic villus; they are most conveniently studied in peripheral blood lymphocytes.