Final answer:
Sister chromatid exchange is elevated in conditions such as chromosomal disorders or certain cancers like chronic myelogenous leukemia.
Step-by-step explanation:
Sister chromatid exchange is often found to be elevated in certain types of cells or conditions. During the process of DNA replication, a sister chromatid is one of a pair of identical chromosomes.
However, it is not sister chromatids that typically undergo exchange of genetic material, but rather non-sister chromatids of homologous chromosomes do during the process of crossover. This genetic recombination is a crucial aspect of meiosis, contributing to genetic diversity.
That being said, an elevated rate of sister chromatid exchange may be indicative of certain genetic instabilities and can be seen in conditions such as chromosomal disorders or certain cancers, for instance, chronic myelogenous leukemia, which can involve translocations between chromosomes.