Mendel dihybrid: F2 ratio 9:3:3:1 sums to 16 = 2^4; fractions sum to 1

Layer 3 — Biologyin the biotechnology subtree

Sympy-exact witness of the Mendelian F2 dihybrid ratio 9:3:3:1 arithmetic invariants. Setup: monohybrid F2 = {AA, Aa, aa} with 1:2:1 genotype ratio and 3:1 phenotype ratio under complete dominance. Dihybrid F2 (AaBb × AaBb with…

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Hardy-Weinberg: p² + 2pq + q² = (p+q)² = 1; F2 3:1 and 9:3:3:1

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