What statement best describes the primary benefit of cryopreservation for mouse strains?

• A. It permanently mutates the genome
• B. It allows long-term storage and on-demand availability
• C. It prevents disease
• D. It accelerates breeding

Answer: (B)

Cryopreservation focuses on preserving mouse strains for the long term and bringing them back when needed. By freezing embryos, sperm, or oocytes, a line can be stored without maintaining a live, actively bred colony, saving space and resources and protecting against loss from unforeseen events. When the strain is required again, it can be revived on demand, giving researchers access to the same genetic material without continual breeding. This is how genetic material is kept stable over time and reintroduced as needed. Cryopreservation does not mutate the genome, does not function primarily to prevent disease, and it does not accelerate breeding; its main benefit is enabling long-term storage and on-demand availability.