Question

the genetic disease cystic fibrosis (cf) occurs when a person manufactures a protein that includes one wrong amino acid. which statement best describes the possible source of this error?
the error is caused by an extra chromosome found within the persons cells.
the error is caused by a change within the gene of the persons cells.
the error is caused by a missing chromosome within the persons cells.
the error is caused by the addition of extra dna within the persons cells.

Explanation:

Cystic fibrosis is a genetic disorder. Proteins are synthesized based on the information encoded in genes. A change (mutation) within a gene (which is a segment of DNA) can lead to the production of a protein with an incorrect amino acid. Extra or missing chromosomes (aneuploidy) typically cause other types of genetic syndromes (e.g., Down syndrome - extra chromosome 21). Addition of extra DNA in a non - gene related, non - specific way is not the typical cause of a protein with a single incorrect amino acid. The key here is that genes code for proteins, and a gene mutation can result in an incorrect amino acid in the protein.

Answer:

The error is caused by a change within the gene of the person's cells.