Sasha Has a Genetic Error

question 33

Multiple Choice

Sasha has a genetic error.She has specific physical features,such as a wide tongue,and she is mentally retarded.Upon examining her chromosomes,we would find an extra 21ˢᵗ chromosome.What disorder does Sasha have?

• A) fragile X syndrome
• B) Down syndrome
• C) anencephaly
• D) Alzheimer's disease

---

Definitions:

Positive Predictive Value

The probability that subjects with a positive screening test truly have the disease.

Prevalence

The total number of cases of a disease that exist in a particular population at a specific time.

False-Positive Diagnosis

An erroneous identification where a test incorrectly indicates the presence of a condition that is actually absent.

Diagnostic Procedures

Medical tests and evaluations performed to identify the presence of a disease or determine its severity in a patient.