Do we need to know this for OCR A alevel biology (cell division)

In the cell division topic, the specification says I need to know about " the production of erythrocytes and neutrophils as examples of distinct, differentiated cells derived from a common stem cell in bone marrow". And on save my exams goes into loads of detail about erythropoiesis but I'm not sure if I actually need to know that whole process or if I just need to know that erythrocytes are formed from bone marrow stem cells? If anyone could clarify this it would be really helpful.