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Example2 - 3 TRAIT 2 expressed(aaB 1 No dominant traits...

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Example: Two Gene Loci Let S = smooth, s = wrinkled Let Y = yellow, y = green P 1 SMOOTH, YELLOW X wrinkled, green genotypes: SSYY ssyy gametes: SY sy ↓ F 1 SMOOTH, YELLOW X SMOOTH YELLOW genotypes: SsYy X SsYy ← Α χροσσ βετϖεεν τϖο ινδιωιδυαλσ τηατ αρε ηετεροζψγουσ φορ τϖο γενε λοχι ισ χαλλεδ α διηψβριδ χροσσ . gametes: SY, Sy, sY, sy ↓ F 2 Mendel's Results SMOOTH, YELLOW 315 SMOOTH, green 108 wrinkled, YELLOW 101 wrinkled, green 32 556 A general rule for dihybrid crosses (AaBb X AaBb) TRAIT 1, TRAIT 2 X trait 1, trait 2 (upper case traits are dominant) 9 - TRAIT 1 and TRAIT 2 expressed (A-B-) 3 - TRAIT 1 expressed (A-bb)
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Unformatted text preview: 3 - TRAIT 2 expressed (aaB-) 1 - No dominant traits expressed (all aabb) A dihybrid cross is two monohybrid crosses Remember that each of the individual traits in the dihybrid cross above behaves as a monohybrid cross, that is, they will produce a 3:1 phenotype ratio in the offspring. SMOOTH X wrinkled Refer to the F 2 data for the SMOOTH, YELLOW X wrinkled, green cross above. The number of smooth offspring was 315 + 108 = 423. The number of wrinkled was 101 + 32 = 133. The ratio of smooth to wrinkled is therefore 423:133 or approximately 3:1. YELLOW X green yellow = 315 + 101 = 416 green = 108 + 32 = 140 ratio = 416:140 or approximately 3:1...
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