What does the generation called F2 represent among transgenic mice?

What does the generation called F2 represent among transgenic mice?

• A. The founder of a line
• B. The first generation offspring of the founder of a line
• C. The second generation offspring of the founder of a line
• D. The brother-sister mating of founders of a line

Answer: (C)

In transgenic mouse work, generations are named relative to the original founder carrying the transgene. The founder is the starting animal, and their first-generation offspring come from breeding that founder with a non-transgenic partner. The second generation, called F2, is produced when those first-generation animals are bred (either with each other or with other line animals). So F2 are the second generation offspring of the founder’s line. This designation is not the founder itself, nor the first-generation offspring, nor a mating between founders. F2 represents the next generation after F1, used to study stable transmission of the transgene and inheritance patterns within the line.

In transgenic mouse work, generations are named relative to the original founder carrying the transgene. The founder is the starting animal, and their first-generation offspring come from breeding that founder with a non-transgenic partner. The second generation, called F2, is produced when those first-generation animals are bred (either with each other or with other line animals). So F2 are the second generation offspring of the founder’s line.

This designation is not the founder itself, nor the first-generation offspring, nor a mating between founders. F2 represents the next generation after F1, used to study stable transmission of the transgene and inheritance patterns within the line.