BIO 202 Lecture Notes - Lecture 26: Epistasis, Dihybrid Cross, Soil Ph

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Cross heterozygotes for 1 character (i. e. flower color) Seed color yellow (y: dominant) or green (y: recessive) (two alleles) Seed shape round (r: dominant) or wrinkled (r: recessive) Does inheriting round vs. wrinkled affect your chances of inheriting yellow vs. green? . P generation: 2 strains that are true-breeding (homozygous) either for both. Yyrr (yellow, round) and yyrr (green, wrinkled) Cross yyrr x yyrr for f1 generation: heterozygous for both characters yyrr. Next step: the dihybrid cross cross heterozygotes for 2 characters (yyrr x yyrr) Mendel realized these results showed that different traits are inherited independently . Law of independent assortment: distribution of alleles of 2 different genes into gametes is random. Getting the round allele doesn"t affect your chances of getting the green one. Considering 1 trait: monohybrid can make 2 kinds of gametes (yy makes y or y) Considering 2 traits: dihybrid can make 4 kinds of gametes (yyrr makes yr yr yr yr)

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