Explanation
The most likely sex chromosome composition of the individual with non-disjunction of sex chromosomes at mitosis is XXY, which is also known as Klinefelter syndrome.
Non-disjunction is an error that can occur during cell division, where chromosomes fail to separate properly. In the case of a male individual, non-disjunction of sex chromosomes at mitosis can lead to the formation of sperm cells with an extra X chromosome, resulting in an XXY karyotype.
Option A (XY) is the normal male karyotype, and non-disjunction of sex chromosomes at mitosis would not result in this karyotype.
Option B (XO) is the karyotype of individuals with Turner syndrome, which is caused by the absence of an X chromosome in females.
Option D (XYY) is the karyotype of individuals with Jacob syndrome, which is a rare chromosomal disorder. However, non-disjunction of sex chromosomes at mitosis would not result in this karyotype.
Therefore, the most likely sex chromosome composition of the individual with non-disjunction of sex chromosomes at mitosis is XXY (Option C).
