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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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- Fall '10
- Biology, Ratio, Self number, Trait, Purple