The pedigree below shows the occurrence of red-green colorblindness in four generations of a family. Use the information in the pedigree to answer Numbers 36 and 37.
 
Which of these best explains the pattern of inheritance for the colorblindness trait?
F   The allele for colorblindness is not sex-linked.
G   The allele for colorblindness is carried on the X-chromosome.
H   The allele for colorblindness is dominant to the allele for normal vision.
J   The allele for colorblindness occured in Generation II as a new random mutation.