Question

Question
Which type of mutation causes cystic fibrosis?(1 point)
Responses

substitution
substitution

insertion
insertion

silent
silent

deletion

Answer 1

Cystic fibrosis is caused by a **deletion** mutation. Specifically, it often results from the deletion of three nucleotides in the CFTR gene, which leads to the loss of a single amino acid (phenylalanine) in the protein. Therefore, the correct answer is:

**deletion**.