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In squirrels, allele T1 results in tufted ears, whereas allele T2 results in hairless ears. How...

In squirrels, allele T1 results in tufted ears, whereas allele T2 results in hairless ears. How would you determine the relationship between tufted ears or hairless ears (i.e., is one dominant, recessive, or are they incompletely dominant or codominant)?

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Answer #1

Assuming that the gene coding for the smooth seeds is S and the gene coding for the wrinkled seeds is s, we can perform test cross to determine which gene is dominant and recessive.

Thus, the test cross between the pure breed of tufted ears (T1T1) and hairless ears (T2T2) will have the offspring with the following genotypes.

T1T1* T2T2 -----> T1T2 (100%)

If the T1T2 phenotype is tufted ears, it indicates that the T1 is dominant over T2 (or T2 is recessive to T1), if the phenotype of T1 and T2 is not tufted or hairless ears, T1 and T2 are incompletely dominant or codominant.

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