Which observation is a valid indicator of strain identity including genetic status?

Which observation is a valid indicator of strain identity including genetic status?

• A. Breeding performance
• B. Coat color of offspring
• C. Genotype testing (PCR)
• D. All of the above

Answer: (C)

The most reliable way to confirm strain identity and genetic status is to examine the DNA directly. Genotype testing using PCR targets specific DNA markers unique to a strain and can reveal precise information about zygosity, presence of particular alleles, transgenes, or mutations. This provides objective, verifiable evidence that isn’t influenced by the animal’s environment or how it was bred. Breeding performance depends on many factors—care, nutrition, age, and health—so it isn’t a dependable indicator of genetic background. Coat color can be influenced by multiple genes and cross-breeding; similar colors can appear in different strains, making it an unreliable identifier on its own. Therefore, genotype testing via PCR is the best choice for accurately determining strain identity and genetic status.

The most reliable way to confirm strain identity and genetic status is to examine the DNA directly. Genotype testing using PCR targets specific DNA markers unique to a strain and can reveal precise information about zygosity, presence of particular alleles, transgenes, or mutations. This provides objective, verifiable evidence that isn’t influenced by the animal’s environment or how it was bred.

Breeding performance depends on many factors—care, nutrition, age, and health—so it isn’t a dependable indicator of genetic background. Coat color can be influenced by multiple genes and cross-breeding; similar colors can appear in different strains, making it an unreliable identifier on its own.

Therefore, genotype testing via PCR is the best choice for accurately determining strain identity and genetic status.