If wire hair (W) is dominant to smooth hair (w), and you find a wire-haired puppy, which type of puppy would you use in a testcross to determine its genotype?
A. Heterozygous wire-haired puppy
B. Homozygous wire-haired puppy
C. Heterozygous smooth-haired puppy
D. Any smooth-haired puppy
E. True-breeding wire-haired puppy
Answer: D
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