Final answer:
Klinefelter syndrome is a genetic disorder that affects males and is characterized by the presence of an extra X chromosome, resulting in male external sex characteristics but with some female secondary sex characteristics.
Step-by-step explanation:
The condition being referred to in the question is Klinefelter syndrome. Klinefelter syndrome is a genetic disorder that affects males and is characterized by the presence of an extra X chromosome, resulting in a genotype of XXY. In this syndrome, individuals have male external sex characteristics, but they may also have some female secondary sex characteristics, such as enlarged breasts. This is due to the imbalance of sex hormones caused by the extra X chromosome.