THE MOLECULAR BASIS OF INHERITANCE
GENE MUTATION
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[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Detailed explanation-1: -Physical mutagens include electromagnetic radiation, such as gamma rays, X rays, and UV light, and particle radiation, such as fast and thermal neutrons, beta and alpha particles.
Detailed explanation-2: -Ultraviolet (UV) light is a form of radiation that acts as a mutagen, an agent that causes mutations in DNA. Exposure to ultraviolet light causes chemical changes that alter the shape of your DNA, and the process that corrects DNA’s shape can also cause changes to the DNA code.
Detailed explanation-3: -Mutations result either from errors in DNA replication or from the damaging effects of mutagens, such as chemicals and radiation, which react with DNA and change the structures of individual nucleotides. All cells possess DNA-repair enzymes that attempt to minimize the number of mutations that occur (Section 14.2).
Detailed explanation-4: -Anything that causes a mutation (a change in the DNA of a cell). DNA changes caused by mutagens may harm cells and cause certain diseases, such as cancer. Examples of mutagens include radioactive substances, x-rays, ultraviolet radiation, and certain chemicals.