The CLCN-1 gene creates tube structures in muscles known as channels. These tubes help control how muscles contract and relax. CLCN-1 specifically constructs channels using chlorine.

Question

Which is an example of a helpful mutation in CLCN-1?
CLCN-1 genes work faster to allow muscles to contract and relax faster.
CLCN-1 genes create chlorine channels to allow muscles to contract and relax.
CLCN-1 genes construct chlorine channels that fall apart shortly after construction.
CLCN-1 genes incorrectly construct chlorine channels, and the channels do not work.

Answer 1

A helpful mutation in the CLCN-1 gene would ideally enhance its normal function or improve muscle activity rather than impair it. Among the options provided, the statement that represents a potentially helpful mutation is:

CLCN-1 genes work faster to allow muscles to contract and relax faster.

This mutation would improve muscle function by enhancing the efficiency of muscle contraction and relaxation. The other options either describe non-functional or harmful mutations, which would not be considered helpful.