A research lab requires a supply of pure-breeding freckled frogs (FF) for a cloning experiment. A lab assistant has a pet frog with freckles, but it's uncertain if it is homozygous or heterozygous. A test-cross is needed. The pet frog is crossed with a homozygous recessive smooth (non-freckled) frog (ff). Half of the offspring are freckled frogs, and half are smooth. What does this tell you about the pet frog? What would be the predicted result if that frog had a different genotype but the same phenotype?
Added by -Ngel S.
Step 1
The pet frog has freckles, so it must have at least one dominant allele (F). Its genotype is either homozygous dominant (FF) or heterozygous (Ff). Show more…
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