Try and see what your textbook says about quantitative traits or incomplete dominance. It can probably explain it more accurately than I can: The lowest value phenotype will occur when there are 0 contributing alleles, and the highest value phenotype will occur when all of the alleles are contributing. Aabb 25 is expressed when there are 2 contributing alleles: AaBb 30 is expressed when there are 3 contributing alleles: AABb 35 is expressed when there are 4 contributing alleles: So each allele contributed 5 cm to tail length for this problem and there are 4 total alleles regulating tail length.
There are 2 alleles per gene, so the answer to part A is 2 genes. In part B, now we're mating a 15 cm pig 0 contributing alleles and a 30 cm pig 3 contributing alleles. The 15 cm pig will be aabb The 30 cm pig will be AABb.
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Want to add to the discussion? There are 5 phenotypes expressed: AABB So each allele contributed 5 cm to tail length for this problem and there are 4 total alleles regulating tail length. Bb x bb will produce Bb or bb. Most of the other content requires a resolution of x or higher.
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