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.
Sunday, 28 December 2008 01:13. Gen means birth or origin, as in the book of Genesis, which explains the origin of the Earth; Muta means change; terato means monster; and carcino means crab. Thus, all three gens-are physical or chemical agents that cause or originate malformations. Mutagens cause changes (mutations) in the genetic material of cells.