<prompt> Feature of fetal R.B.C. -Alkali denaturation resistantSmall in sizeHas more 2,3 DPG levelMore iron than adult RBC  <response>: Fetal hemoglobin in contrast to Hb A shows the following -increased solubility of deoxy HbF, slower electrophoretic mobility for HbF, increased resistance of HbF to alkali denaturation, HbF has decreased interaction with 2,3-BPG.DM Vasudevan textbook of biochemistry sixth edition pg no 259 