In the snail Cepaea nemoralis, an autosomal allele causing a banded shell (BB) is recessive to the allele for unbanded shell (BO). Genes at a different locus determine the background color of the shell; yellow (CY) is recessive to brown (CB). A banded, yellow snail is crossed with a homozygous brown, unbanded snail. The F1 are crossed with a banded, yellow snail (a testcross). a. What will be the results of the testcross if the loci assort independently? b. What will be the phenotypic results of the testcross if the loci are linked and 20 map units apart? Give the percentages of each phenotype expected.
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