AP BIOLOGY

Detailed explanation-1: -Base substitutions are the simplest type of gene-level mutation, and they involve the swapping of one nucleotide for another during DNA replication. For example, during replication, a thymine nucleotide might be inserted in place of a guanine nucleotide.

Detailed explanation-2: -Substitution. A substitution is a mutation that exchanges one base for another (i.e., a change in a single “chemical letter” such as switching an A to a G).

Detailed explanation-3: -Point Mutation A point mutation occurs in a genome when a single base pair is added, deleted or changed. While most point mutations are benign, they can also have various functional consequences, including changes in gene expression or alterations in encoded proteins.

Detailed explanation-4: -The simplest mutation is a point mutation. This occurs when one nucleotide base is substituted for another in a DNA sequence. The change can cause the wrong amino acid to be produced.

Detailed explanation-5: -Answer and Explanation: The kind of mutation that occurs when one base is changed to another at a single location in the DNA is called a point mutation. Point mutations occur when one single base is changed in the DNA sequence. Although this change is small, it can have serious affects on the protein.