nx_game_genetics.nx

nx_game_genetics.nx -- REAL MENDELIAN GENETICS as the breeding core (ws=game-interact rung 3b; operator: "use Mendelian genetics so we can really reuse systems, fun not overwhelming... educational while entertaining, teach real world science"). THE SCIENCE (this is textbook genetics, implemented honestly -- not a "genetics-flavoured" rng): * DIPLOID genome: every trait carries TWO alleles, one from each parent. * MENDEL'S 1st LAW (SEGREGATION): a parent passes ONE randomly-chosen allele of its pair (a gamete). * MENDEL'S 2nd LAW (INDEPENDENT ASSORTMENT): each trait segregates independently of the others. * The famous emergent ratios are therefore NOT hardcoded -- they FALL OUT: monohybrid Aa x Aa gives genotypes 1:2:1 and phenotypes 3:1; a dihybrid cross gives 9:3:3:1; a test cross gives 1:1. The gate MEASURES them. That is the difference between teaching science and cosplaying it. * Three real inheritance MODES, each the textbook exemplar: SIMPLE dominant/recessive (pea plants; horned/hornless here) INCOMPLETE blending heterozygote (snapdragon flower colour: red x white -> PINK, and F2 is 1:2:1 PHENOTYPES -- the fact that distinguishes it from simple dominance) CODOM multiple alleles + codominance (human ABO blood groups: A and B both expressed -> AB) * CARRIERS are real and visible-to-the-game: a heterozygote showing the dominant phenotype still carries the recessive allele -- the whole reason selective breeding is interesting. FUN, NOT OVERWHELMING (the design constraint): FIVE visible traits, each with an obvious readable phenotype. The player never sees a genotype string unless they ask; the Punnett square (gx_punnett) is the ONE teaching widget -- 4 cells, the real thing, computed not illustrated. Genome packs into ONE i64: trait t occupies 4 bits (two 2-bit alleles) => 5 traits = 20 bits, and it rides the existing companion component word, so nothing else in the parts library changes shape. All integer, deterministic. LIB, no main. license_tier: ORIGINAL