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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.

The F2 offspring can only be AaBb or Aabb, which is 2 and 1 contributing alleles. So the F2 generation will have 20 or 25 cm tails. Use of this site constitutes acceptance of our User Agreement and Privacy Policy. Log in or sign up in seconds. Submit a new text post.

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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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