The following are sex linked inherited disease -a) G6PD deficiencyb) Hypogamma globulinemiac) Downs syndromed) Diamond blackfan diseasee) Hemophilia

**Core Concept**
Sex-linked inherited diseases are conditions caused by mutations in genes located on the sex chromosomes, X or Y. These diseases can be inherited in an X-linked recessive or dominant pattern, where males are more frequently affected due to having only one X chromosome.

**Why the Correct Answer is Right**
Hemophilia is a classic example of an X-linked recessive disorder, where the deficiency of clotting factors (Factor VIII or IX) leads to impaired blood coagulation. This condition predominantly affects males, who have only one X chromosome and therefore only one copy of the affected gene. Females, on the other hand, have two X chromosomes, making them carriers of the disease but less likely to express it. The presence of the normal X chromosome compensates for the mutated gene, reducing the severity of the condition.

**Why Each Wrong Option is Incorrect**
**Option A:** G6PD deficiency is an X-linked recessive disorder, but it is not a sex-linked inherited disease in the classical sense, as it affects both males and females equally. It is caused by mutations in the G6PD gene, leading to impaired glucose-6-phosphate dehydrogenase activity.

**Option B:** Hypogammaglobulinemia is an immunodeficiency disorder characterized by low levels of antibodies in the blood. While it can be inherited, it is not typically considered a sex-linked disease.

**Option C:** Down syndrome is a genetic disorder caused by an extra copy of chromosome 21. It is not a sex-linked inherited disease.

**Option D:** Diamond-Blackfan anemia is a rare congenital disorder affecting the production of red blood cells. It is not typically classified as a sex-linked inherited disease.

**Clinical Pearl / High-Yield Fact**
When considering sex-linked inherited diseases, remember that males are more frequently affected due to their single X chromosome. Females, as carriers, may exhibit milder symptoms or be asymptomatic due to the presence of a normal X chromosome.

**Correct Answer:** e) Hemophilia