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.
Mutations can also take place because of human involvement such as breeding, applying mutagens, propagation, or by cultural practices. In these cases, the new group of mutated plants is called a cultivar. Cultivar is an abbreviated form of cultivated variety. The mutated plants are assigned a cultivar name. A. Cultivar names are given when the mutation occurs due to human influence.