Question

Which one of the following is caused by the expression of a recessive gene present on an chromosome?

• A. Muscular dystrophy
• B. Nervous shock
• C. Rheumatism
• D. Cerebral haemorrhage

Answer 1

The correct option is A Muscular dystrophy

Muscular dystrophy (MD) is a group of muscle diseases that results in increasing weakening and breakdown of skeletal muscles over time. The disorders differ in which muscles are primarily affected, the degree of weakness, how fast they worsen, and when symptoms begin. Many people will eventually become unable to walk. Some types are also associated with problems in other organs. They are due to mutations in genes that are involved in making muscle proteins. This can occur due to either inheriting the defect from one's parents or the mutation occurring during early development. Muscular dystrophy can be inherited by individuals as an X-linked disorder, a recessive or dominant disorder. Furthermore, it can be a spontaneous mutation which means errors in the replication of DNA and spontaneous lesions.

So the correct option is 'Muscular Dystrophy'.