Testcross results of three
   yellow, round individuals
   What is the expected F[1] phenotypic ratio if the test parent had a
   genutype of GGWW?
   If the test parent had a genotype of GGWw, the F[1] would show a
   genotype  ratio  of  1/2  GgWw  and 1/2 Ggww. If the test parent had a
   genotype  of  GgWw,  the F[1] would show a genotype ratio of 1/4 GgWw,
   1/4  Ggww,  1/4  ggWw,  1/4 ggww. If the test parent had a genotype of
   GgWW, the F[1] would show a genotype ratio of 1/2 GgWw and 1/2 ggWw.