AP BIOLOGY

Detailed explanation-1: -Such a substitution could: change a codon to one that encodes a different amino acid and cause a small change in the protein produced. For example, sickle cell anemia is caused by a substitution in the beta-hemoglobin gene, which alters a single amino acid in the protein produced.

Detailed explanation-2: -Substitution mutations can be good, bad, or have no effect. They cause three specific types of point mutation: silent, missense, and nonsense mutations. A silent mutation is one where the function of the protein is not changed. A missense mutation codes for the wrong protein.

Detailed explanation-3: -Mutations can be of many types, such as substitution, deletion, insertion, and translocation.

Detailed explanation-4: -Types of Substitution Mutations Within the four nucleotides, there are two types: the purines and pyrimidines. Adenine (A) and guanine (G) are both purines, while cytosine (C) and thymine (T) are pyrimidines. If a purine changes to a purine, the substitution mutation is considered a transition.