Question

The largest known gene is in the human being and has 79 exons spanning at least 2,300 kilobases (kb) DNA. It is:

• A. Dystrophin gene
• B. Growth hormone gene
• C. Metalloendopeptidase gene
• D. Nerve Growth Factor gene

Hint:

Dystrophin gene: largest human gene (2.3 Mb, 79 exons).
Mutations cause Duchenne muscular dystrophy.
Located on the X chromosome.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
The human genome contains many genes of varying sizes.
Some genes are very large.

Step 2: Key Formula or Approach:
No specific formula.
Need to know the largest human gene.

Step 3: Detailed Explanation:
The dystrophin gene (DMD) is the largest known human gene.
It spans approximately 2,300 kb (2.3 Mb).
It has 79 exons.
Mutations in this gene cause Duchenne muscular dystrophy.
Thus, the correct answer is the dystrophin gene.

Step 4: Final Answer:
The largest known human gene is the dystrophin gene.
Hence, the correct option is (A).