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

Question

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

Quizplus · Accepted Answer

A test cross involves crossing the individual in question with a homozygous recessive individual to determine the genotype of the first individual. Since smooth hair (w) is recessive, any smooth-haired puppy would be homozygous recessive (ww) and suitable for a test cross to determine if the wire-haired puppy is homozygous dominant (WW) or heterozygous (Ww).

If Wire Hair (W)is Dominant to Smooth Hair (W),and You