An individual with XXY chromosomes is male.
Understanding Sex Chromosomes
Sex chromosomes determine a person's genetic sex. The two types are X and Y. Typically:
- Females have two X chromosomes (XX).
- Males have one X and one Y chromosome (XY).
Klinefelter Syndrome
The reference material states that in Klinefelter syndrome, a boy is born with an extra copy of the X chromosome, resulting in an XXY combination. This indicates that the presence of a Y chromosome determines maleness, even with an extra X chromosome.
Key Takeaway
- The presence of the Y chromosome typically dictates the development of male characteristics.
Therefore, despite having an extra X chromosome, a person with XXY chromosomes is classified as male.
