You have generated mutations in the DNA sequence of a eukaryotic promoter at its TATA box, resulting in severely reduced transcription of the downstream gene. You have identified a suppressor mutation at an independent gene locus that restores transcription of this gene. This suppressor mutation is most likely a DNA sequence that encodes:

"griffith's experiment discovering the "transforming principle" in pneumococcus bacteria. griffith's experiment, reported in 1928 by frederick griffith, was the first experiment suggesting that bacteria are capable of transferring genetic information through a process known as transformation." - griffith's experiment.

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.

i think the answer is a.keratin is the pigment responsible for skin color.