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AP Bio: IST‑1 (EU), IST‑1.F (LO), IST‑1.F.1 (EK), IST‑1.H (LO), IST‑1.H.1 (EK), IST‑1.H.2 (EK), IST‑1.H.3 (EK)
How meiosis reduces chromosome number by half: crossing over, meiosis I, meiosis II, and genetic variation.