One alien is heterozygous for his green color (Gg) and the other alien is recessive for her blue color (gg).

Which of these describes the genotypic ratios of the offspring expected from this cross?

a. 50% green and 50% blue
b. 100% green and 0% blue
c. 50% Gg and 50% gg
d. 100% Gg and 0% gg