Genetics Chart

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Mendelian chart for chickens. P is parent with black dominant and white recessive, F1 is the hybrid generation of “blue” Andalusians, illustrating imperfect dominance, F2 is the second generation with 25% pure black (DD), 50% blues (DR), and 25% pure whites with black spots (RR)

Source

Thomson, J. Arthur The Outline of Science volume II (New York, NY: G.P. Putnam's Sons, 1922)

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