Final answer:
Turner syndrome is characterized by an XO genotype, indicating the presence of a single X chromosome and resulting in various physical and developmental traits in females.
Step-by-step explanation:
People with Turner syndrome have a chromosome constitution that is characterized as an XO genotype, which means they have only a single sex chromosome. The correct option for this condition is C. XO. This genotype results in a female individual with features such as short stature, webbed skin in the neck region, hearing and cardiac impairments, and sterility.
Unlike other sex chromosome abnormalities, Turner syndrome involves the presence of only one X chromosome without the presence of a second X or Y chromosome.