The Jak1 gene encodes a transcription factor that binds to the promoter region of another gene. The Jak1 gene diagramed below has only one promoter and is located in a region of the genome containing no other genes. You discover a mutation in the Jak1 gene that results in a protein with altered binding affinity. This mutation could be located: True False A, in the promoter region. B, within the first exon. C, at a splice site. D, downstream of the last exon. <