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.
Confidence votes 20.9K. Gene therapy. In most gene therapy studies a 'normal' gene is inserted into the genome to replace an 'abnormal' disease-causing gene. A carrier molecule called a vector must be used to deliver the therapeutic gene to the patient's target Cells.onfidence votes 20.9K. Gene therapy. In most gene therapy studies a 'normal' gene is inserted into the genome to replace an 'abnormal' disease-causing gene. A carrier molecule called a vector must be used to deliver the therapeutic gene to the patient's target Cells.