In Drosophila, the autosomal recessive bw causes a dark brown eye, and the unlinked autosomal recessive st causes a bright scarlet eye. A homozygote for both genes has a white eye. Thus, we have the following correspondences between genotypes and phenotypes: st+/st+ ; bw+/bw+ = red eye (wild type) st+/st+ ; bw/bw = brown eye st/st ; bw+/bw+ = scarlet eye st/st ; bw/bw = white eye Construct a hypothetical biosynthetic pathway showing how the gene products interact and why the different mutant combinations have different phenotypes.
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