Final answer:
Physical features of Fragile X Syndrome include a long face and long ears, among other facial characteristics such as a below-average head circumference and a thin upper lip. Option 4, which encompasses both a long face and long ears, is the correct answer to the question.
Step-by-step explanation:
Physical Features of Fragile X Syndrome (FXS)
Fragile X Syndrome (FXS) is a genetic disorder with various phenotypic effects, including developmental delays and a distinctive facial appearance. Some of the physical features associated with FXS include a long face and larger ears, which can sometimes be described as out of proportion to the head size. Specific characteristics often observed are below-average head circumference, smaller than average eye opening with skin folds at the corners of the eyes, a low nasal bridge, short nose, a smaller midface size, and a thin upper lip with an indistinct philtrum. In addition to facial features, skeletal anomalies such as fovea capitis on the head of the femur may be present. Regarding the options provided, both a long face (1) and long ears (3) can be associated with FXS, making option 4, both A and C, correct.