Cystic fibrosis is a disorder that causes the mucus glands to produce very thick mucus. Problems with the respiratory and digestive
systems often occur in individuals with this condition. Like many disorders, cystic fibrosis occurs when there is a simple change, or
mutation, in the DNA of a particular gene
According to the information above, genetic mutations
A
usually result in the release of excess mucus.
B.
can only cause diseases in plants and wild animals.
C.
can contribute to or cause diseases in humans
D. will always cause death in humans

Genetic mutations, even very small ones, can contribute to or cause diseases in humans. Cystic fibrosis, colorblindness, hemophilia, and sickle cell disease can all occur from a point mutation, or a mutation in a single base pair in a strand of DNA. While some diseases caused by mutations have only minor effects, many can cause serious problems.

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