Two genes interact to produce various phenotypic ratios among F2 progeny of a di

Question

Two genes interact to produce various phenotypic ratios among F2 progeny of a dihybrid cross. Design a different pathway explaining each of the F2 ratios below, using hypothetical genes R and T and assuming that the dominant allele at each locus catalyzes a different reaction or performs an action leading to pigment production. The recessive allele at each locus is null (loss-of-function). Begin each pathway with a colorless precursor that produces a white or albino phenotype if it is unmodified. The ratios are for F2 progeny produced by crossing wild-type F1 organisms with the genotype RrTt.

9/ 16 black: 3/16 gray : 4/16 albino

CHOOSE A,B,C

A)If both dominant alleles are present, the result is black. At least one copy of one specific dominant allele is required for gray. If that dominant allele is not present, the result is albino, regardless of whether the other dominant allele is present B) At least one copy of each dominant allele results in black, at least one copy of either dominant allele produces gray, and the absence of both dominant allele produces albino. C) At least one copy of both dominant alleles results in albino; at least one copy of one of the dominant alleles also results in albino, but at least one copy of the other dominant allele produces black, and the absence of either dominant allele produces gray.

Explanation / Answer

B) At least one copy of each dominant allele results in black, at least one copy of either dominant allele produces gray, and the absence of both dominant allele produces albino

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