Haemoglobin first appears in which stage of erythropoiesis?: (A) Basophil erythroblast, (B) Proerythroblast, (C) Ohochromatic erythroblast, (D) Polychromatophil erythroblast
Answer is A. Once the proerythroblast has been formed, it divides multiple times, eventually forming many mature RBCs. The first-generation cells are called basophil erythroblasts because they stain with basic dyes; the cell at this time has accumulated very little hemoglobin.