Final answer:
Acentric chromosomes lack a centromere, while dicentric chromosomes have two centromeres.
Step-by-step explanation:
In the context of chromosomes, the terms acentric and dicentric are used to describe the structure of chromosomes after an inversion has occurred.
An acentric chromosome is one that lacks a centromere, which is a specific region on a chromosome that plays a role in cell division. A dicentric chromosome, on the other hand, has two centromeres.
The presence of an acentric or dicentric chromosome can lead to problems during cell division, as it can cause abnormal chromosome segregation.