While blizzards often feature extreme cold and heavy snow, there are actually no temperature or snow depth requirements for a storm to qualify as a blizzard. Occasionally, blizzard conditions will present when there is no precipitation.
Definition. A Mutation occurs when a DNA gene is damaged or changed in such a way as to alter the genetic message carried by that gene. A Mutagen is an agent of substance that can bring about a permanent alteration to the physical composition of a DNA gene such that the genetic message is changed.efinition. A Mutation occurs when a DNA gene is damaged or changed in such a way as to alter the genetic message carried by that gene. A Mutagen is an agent of substance that can bring about a permanent alteration to the physical composition of a DNA gene such that the genetic message is changed.
A mutagen is a substance which increases the frequency of mutation in a plant or animal population, which can lead to a variety of consequences. Some chemicals have mutagenic properties, and radiation such as ultraviolet light and x-rays is another common source of mutations. Because mutagens can lead to genetic mutations, some of them can contribute to the development of cancers, making these mutagens carcinogenic in addition to mutagenic.