Final answer:
A high percentage of blast cells in the leukocyte population suggests a poor prognosis for someone with acute leukemia due to the overproduction of immature, nonfunctional leukocytes.
Step-by-step explanation:
A high percentage of blast cells in the leukocyte population indicates a poor prognosis for an individual with acute leukemia. Blast cells are immature leukocytes that are typically overproduced in acute leukemia. In this disease, there is an overproduction of these young, immature leukocytes which do not function properly, leaving the individual vulnerable to infections and other complications.