Final answer:
A block in the differentiation or maturation of immature hematopoietic progenitors is a hallmark of hematopoietic disorders such as leukemia.
Step-by-step explanation:
Hematopoiesis is the process of proliferation and differentiation of blood cells. A block in the differentiation or maturation of immature hematopoietic progenitors is a hallmark of hematopoietic disorders such as leukemia.
These disorders occur when the normal process of cell development is disrupted, leading to the accumulation of immature cells.