In the island model with symmetric migration, how does increasing the migration rate m affect Fst?

• A. Fst decreases as m increases; Fst ≈ 1/(1+4Nm).
• B. Fst increases with m; Fst ≈ 1 - 1/(1+4Nm)
• C. Fst is independent of m
• D. Fst equals 1 regardless of m

Answer: (C)