Final answer:
Nondisjunction can occur in both autosomes and sex chromosomes and is false to state otherwise. It leads to aneuploidy, which is the presence of an abnormal number of chromosomes in cells.
Step-by-step explanation:
The statement that nondisjunction can occur in the autosomes but never occurs in the sex chromosomes is false. Nondisjunction is the failure of homologous chromosomes to separate during meiosis I or the failure of sister chromatids to separate during meiosis II. It can result in the formation of gametes containing an abnormal number of chromosomes (n+1 or n-1), a condition known as aneuploidy. This can occur in both autosomes and sex chromosomes. For instance, nondisjunction of sex chromosomes can lead to conditions such as Klinefelter syndrome (XXY) or Turner syndrome (XO).