Three to One

Gregor Mendel chose seven pea traits that come in exactly two forms, grew about 28,000 plants over eight years, and counted every one. The ratio he found — three to one — is the proof that inheritance comes in discrete pieces, and it went unread for thirty-four years. Run his crosses, see why sample size matters, and watch blending inheritance destroy variation. Episode 05 of the Great Scientists series.

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