Final answer:
Nondisjunction during mitosis can lead to mosaicism, which is the presence of cells with different genetic makeup within the same organism, often resulting in cells with extra or missing chromosomes.
Step-by-step explanation:
The nondisjunction event that occurs during mitosis, leading to a subset of cells that are genetically different from others in the organism, results in a condition known as mosaicism. During normal mitosis, sister chromatids are supposed to separate and go to different daughter cells. However, nondisjunction can happen when sister chromatids fail to separate properly, leading to cells with an abnormal number of chromosomes, or aneuploidy. This condition can contribute to various genetic disorders and abnormal growth patterns.