AP BIOLOGY

Detailed explanation-1: -Typically, the body corrects most mutations. A single mutation will likely not cause cancer. Usually, cancer occurs from multiple mutations over a lifetime. That is why cancer occurs more often in older people.

Detailed explanation-2: -B. Silent mutations are a result of the redundancy (degeneracy) of the genetic code: This is false, as silent mutations are the result of a base substitution that has no discernible effect on the amino acid sequence of a protein.

Detailed explanation-3: -No; only a small percentage of variants cause genetic disorders-most have no impact on health or development. For example, some variants alter a gene’s DNA sequence but do not change the function of the protein made from the gene.

Detailed explanation-4: -Cancers are caused by a change in, or damage to, one or more genes. Most changes in a gene are because of a gene mutation. Mutations can stop genes from working properly. Genes that have mutations that are linked to cancer are sometimes called cancer genes.