Which of the following symptoms is associated with Fragile X syndrome?

B. Autistic behaviors are commonly associated with Fragile X syndrome, which is a genetic condition resulting from a mutation of the FMR1 gene. This syndrome is known to produce a range of behavioral phenotypes, including social difficulties, anxiety, and distinctive autistic characteristics. Many individuals with Fragile X syndrome exhibit behaviors that can be categorized along the autism spectrum, including challenges with social communication and interactions, repetitive behaviors, and restricted interests. This linkage has been widely documented in scientific literature, making it a primary symptom of the condition.

In contrast, short stature, hyperthyroidism, and Turner syndrome are not characteristics directly associated with Fragile X syndrome. Short stature may be seen in various genetic or environmental conditions but is not specifically linked to Fragile X. Hyperthyroidism refers to overactivity of the thyroid gland and does not pertain to Fragile X syndrome. Turner syndrome is a distinct genetic disorder caused by the absence of all or part of a second sex chromosome, which presents with its own set of symptoms and is unrelated to the behaviors seen in Fragile X syndrome.