Turner syndrome is characterized by which chromosomal condition?

Turner syndrome is a genetic condition that results from the complete or partial absence of one of the two X chromosomes in females. This typically leads to a chromosomal count of 45 chromosomes instead of the usual 46. More specifically, individuals with Turner syndrome often have a karyotype designated as 45,X, meaning they have only one X chromosome and no second sex chromosome (Y or another X). This aneuploid condition is associated with a variety of physical and developmental characteristics, such as short stature, delayed puberty, and various other health concerns.

The other options refer to different chromosomal abnormalities. The first option describes a condition known as Klinefelter syndrome, which involves an extra X chromosome. The third option pertains to Down syndrome, characterized by an extra copy of chromosome 21. The last option suggests a typical genetic makeup in males, which does not align with the characteristics of Turner syndrome. Understanding these distinctions is crucial for recognizing how chromosomal variations can lead to different syndromes and health implications.